DIY Acrylic Sump

Tony's Reef

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Who all on here has actually built their own acrylic sump? I'm not talking about going to the store or some URL and purchasing a sump, I'm talking about you go to a plastics shop, you purchase some flat sheet and you turn it into a sump that fits your needs exactly? I'm just curious because back in April 2013, that is exactly what I did. I have a 90 gallon tank with a single overflow that is offset just enough to make my OCD go NUTZ!!! and I needed a sump to go under it. I had a little 15 or 20 gallon under there with a single 7" filter sock, but only just barely enough room for a skimmer and return pump. I looked online and for the size that would fit under my stand and give me the most volume was something around $400 to $500!!! That was just not going to happen.

So I called up a place here in OKC called Regal Plastics. They have or can get any kind of acrylic you want. I settled on 3/16" acrylic, that's 0.1875" or 4.7625mm for you metric folks. Not very thick, but with the walls in this sump, and the lip I ended up putting around the top it was enough. And going from 3/16" to 1/4" was a HUGE jump in price. I'm talking $40 a sheet! Just a little out of my price range at the time so I went with the thinner stuff and designed my sump to match.

I did a lot of research on what style of sump I wanted and to just do a typical sump with a drain section, refugium section and a return section was just boring to me. So I looked all over the net and found the Trigger Systems Ruby ELITE Sump - 36 inch and loved the design. The price of this sump was right around $450 and that just wasn't going to happen! But even still, they didn't have one that was 40", the max I could put into my stand. So I'm leaving 4" unused. Yes, I could use it for my ATO, but that would be a massive ATO container. I guess I could have used the extra room for dosing containers, but I dose Kalk so I don't need 2 or 3 part. So I settled on the Trigger design.

I grabbed pictures from every angle I possibly could and did a quick layout in sketchup to see it in front of me and decided I liked the setup. It works for what I need, lets build it!

Unfortunately, I didn't take as many pictures as I should have back then but the pictures I did take, well you will get the idea. First up is the basic shape of the sump. It is 40" long, by 15" front to back and 16" tall. This is the absolute MAX size I could fit under my stand because of the support bracing on the sides.

20130406_043843.jpg


Don't worry about the piece sitting on top, it was just a scrap piece I had after playing with the acrylic and building a little Pico AIO tank. I still have it and it still has not seen water lol. Also, you will see that the bottom sheet is slightly oversized. It was way easier to do it this way and then use a router to flush cut it to the sides rather than cutting the bottom to size and then matching the walls to the base.

I did a little more work and this is when things got tough. I had to create a wall that separated chamber 1,2 3 and 4. Chamber 1 is where the water flows from the tank into the sump. It is very small and is only there to let the water come down, then back up and into the filter socks. Chamber 2 is the skimmer section which flows into chamber 3 which is the return section and later in life it also became the reactor section as well with some carbon/GFO. Chamber 4 is the refugium which flows into chamber 2 but has a direct path straight to chamber 3. The inlet to the skimmer is on the far corner away from where chanber 4 flows into chamber 2 so there is NO refugium water getting into the skimmer.

Here are a few pictures of that wall as well as putting up the other walls to make the sump, the sump!

20130407_014301.jpg
20130407_014311.jpg
20130407_014323.jpg


Once the Weld-On 3 cured on this one, it was time to put the top rim on the tank for structural support. Like with the bottom, this is oversized and I used a flush cut router bit to make it fit perfectly. Also in this one you can see the two holes for the dual 4" filter socks. These were a royal pain in the butt to make since they have two different sizes in them so the filter socks can sit IN the holes rather than ON the holes. Allows for less water to pass by them.

20130413_040410.jpg


From here I drilled two holes for the drain into the sump, one hole for the refugium and it was pretty much done. Below are pictures of my old sump, draining the tank, getting the old sump out and the new sump in. I of course did a water test for 24 hours on the new sump before doing this to make sure it was not going to explode when the main pump shut off. It doesn't fill up all the way, but it does get up to about 75% capacity if not a little more. So filling it up to the brim and letting it sit outside for 24 hours in the sun should have caused a failure if anything would. And no, this is not UV resistant acrylic, but 24 hours is not going to hurt it. It's still holding (kind of) to this day over 5 years later lol.


20130414_015231.jpg
20130414_015241.jpg
20130414_015249.jpg
20130414_040656.jpg
20130414_040710.jpg


This was a very temporary setup as you will see and the only reason I had it slid to the right was because the drain from the tank fit perfectly into that right hole in the left side of the sump. I still needed to do the plumbing for this thing.

I did not like having only the refugium light as my only light source under the stand so I installed some adhesive LED's to the top of the under side of the stand and connected them with magnetic reed switches. It works GREAT! They are normally open unlike most other things but what this does is allow the Apex to show Open or Closed if the door is Open or Closed! Little detail, but it works lol. And, I have two switches, one for each door, wired in series so I'm only taking up ONE port on my breakout box.

And yes, that line for the return was being pinched here but this was a temp setup just to keep water flowing while I planned out the rest of the plumbing.

20130418_191333.jpg

20130418_191346.jpg

20130418_191303.jpg


Here you can see the area where the water flows into the sump and then into the filter socks.
20130418_191318.jpg


Here you can see the PH Probe (Blue) and the ORP Probe (Red). If you have questions about, ask someone else. I understand it, I know what it does but explaining it is difficult lol. I have since removed that probe from my system since the probe leaked and was showing off the wall readings. I'm talking into the 700's lol. It's nice to have, but in all reality, is not needed.

20130418_191525.jpg


Here is a picture of my ATO (Auto Top Off) float switch. As you can see, it's a bit low but I'm still trying to fine tune the system for the best water level.

20130418_191411.jpg


Here you can see the water level in the return section. Behind it is the refugim that I will be plumbing in when I get the parts this weekend.

20130418_191420.jpg


Once again, this was from 2013 so all of these pictures are pretty old and if I was just now doing it, I would be taking more pictures lol.

I finally got all of the plumbing done and below is what it looked like with a fresh setup. Yes, I let the glue cure for 24 hours before running water through it.

20130419_112740.jpg


Here is a shot of the return back to the tank. As you can see, there is a bit going on here.

20130419_112800.jpg


Here is a shot of the drain into the sump as well as the return to the tank.
20130419_112821.jpg
 
Here you can see that the water is not near as turbulant as it was in the last pics.

20130419_112839.jpg


This picture is just showing the water movement going from chamber #1 to chamber #2.
20130419_112850.jpg


Here is another angle on the return plumbing. As you can see, it comes up from the pump into a 90, over to a corner 90 that drops down to a valve to regulate the refugium, then goes through a one way check valve, through a union to take it all apart then finally up into the tank.

20130419_112906.jpg


Again, here is a full stand shot with everything in the sump

20130419_224150.jpg


Here is a shot of the return pump with the heater.
20130419_224200.jpg


Here is a shot of the left side. The skimmer for some reason was not skimming like it should be, but as of the time of this post, it's doing what it's supposed to.
20130419_224226.jpg


Here is another shot of the right side. That little CFL sucked at growing macro lol.
20130419_224215.jpg


Here is another shot of the inflow to the sump and the filter socks. Just because lol. I still can't believe at just how well this system works.
20130419_224257.jpg


Here is a shot of the tubing that comes from the tank to the sump. This allows me to see if there is air in it. No air means I'm about to over flow the tank. As you can see by the white, there is plenty of air. It helps that I have the pump choked off a bit lol. I have since replaced this piece of flexable tubing with a larger piece that actually fits lol. And yes, I know air makes noise and that I could put a gate valve on it for a 100% siphon, but I only have the one drain and without an emergency drain, that is a very bad idea.
20130419_224307.jpg


Here is an upclose look at the heater. As you can see, 300 watts and working it's butt off to heat this tank up after being shut down for a few hours. However, I noticed a problem. Just below the label, you see some condensation. This is BAD! That is why I now have the top fo the heater out of the water. Just in case there is an electricity bleed. I have since replaced this heater. This pic was from when I first installed the sump.
20130419_224333.jpg


This is the outflow from Chamber #3, the Refugium going back into Chamber #1. As you can see, it's not flowing that fast at all, and I have reduced it even more.
20130419_224245.jpg


This shot shows some of the sand and rock of the refugium. I have since removed all of the sand and added more rock. You can't really see it now because of the algae that is on it so I just used this picture lol.
20130419_224321.jpg


Because I had sand in the refugium, I put the output tube into the refugium into a glass so it woudl force the water back up. Since I no longer have sand in the refugium, I have since removed the glass. The wife was not as impressed as I was at the amount of coralline algae that had grown on the glass lol.
20130419_224349.jpg

20130419_224207.jpg


Here is a larger shot of the refugium. However, because water bends light, it looks more empty than it is. It's almost up to the lip that the black cased light is sitting on, by design.
20130419_224407.jpg

20130419_224233.jpg

I do have a video walking through all of this, but it just shows what is already here. I made the video for my other site and again, I don't know the rules here 100% so better safe than sorry.

I created this post because I'm about to make another sump for this tank because down by where the return pump is I have a large crack where I ended up putting my half filled ATO container in there and it caught the slight lip of the bottom of the sump. I didn't even notice the break until I noticed my salinity was at 25 instead of 26 where I keep it. I started looking around and I found this crack. My only explanation was the ATO was keeping the level, but the water was ever so slowly creeping out of this crack. Surprisingly there was not even any salt creep. Weird.

So how many of you all have actually built your own sump? I'm not talking about taking a 40 breeder and putting glass baffles in it, I"m talking about a 100% "I built this sump" kind of build! If you have, post up and let me know how it went for you. I think I came out pretty good on this setup. The refugium is a little small IMO on this sump and my next one is going to be a pretty basic setup.

The way this one is now the refugium gets very little flow and I want it to be a little higher. I have a DC pump so I can regulate the flow without a ball valve (pictures above show a MagDrive 1200 with a ball valve) to adjust the flow through the center refugium section on the new build. The other reason I'm not building this one again is because to get a light to fit this thing is a royal PITA! If I have a 12x15 inch section for a refugium, I can use any light I want pretty much.

I will definitely post up and let you all know how the new build is coming. I have one sheet of this acrylic left over and it has been in my studio since 2013. I need to test it to see if it is still any good and if it is, I know I can get all the pieces I need out of one sheet. Now I just need to figure out if I still have what it takes to build the thing lol.

Post up if you have done this before!!
 
Last edited:
Very nice job, I did not build the sump itself I started with a 30 gallon tank but also a 90 with offset single overflow. I did acrylic inserts (personal preference) with a rather complicated design of my own but what I didwas use the 1" as my main drain seems the 3/4" as an emergency instead of three return and then ran the return around the back and over the top (for me the emergency overflow gives me peace of mind). I have a fuge, skimmer (that is really an external skimmer), a uv system and a manifold to run the skimmer and two extra outputs for future use. I also did the led strips around the top as a working light (best thing ever).

So far it's only been 2 months but I'm happy with how it's come.
 
Very nice job, I did not build the sump itself I started with a 30 gallon tank but also a 90 with offset single overflow. I did acrylic inserts (personal preference) with a rather complicated design of my own but what I didwas use the 1" as my main drain seems the 3/4" as an emergency instead of three return and then ran the return around the back and over the top (for me the emergency overflow gives me peace of mind). I have a fuge, skimmer (that is really an external skimmer), a uv system and a manifold to run the skimmer and two extra outputs for future use. I also did the led strips around the top as a working light (best thing ever).

So far it's only been 2 months but I'm happy with how it's come.

I have thought about doing that with the return hole. Or, if I can verify this is not a tempered bottom, just drill another hole. Or, if it is not a tempered back, do a custom overflow and return and make this thing as silent as I possibly can lol. So many options, but very limited on a tank in service. And yes, those strip lights are awesome lol.

How much did that end up costing to make?

For a sheet of 3/16" acrylic (which you have to plan for on a 40" sump, otherwise go with 1/4") and the weld-on, I think I spent somewhere around $60-$80 all together in the sump itself. Now if you take into account the tools I needed to get this started, 80 tooth carbide 10" blade for the table saw, a NEW table saw, a high tooth count 7" blade for a circular saw, new router, router bits, then it gets up there lol. but, I use those tools for other things as well so I don't associate them to ONLY acrylic. So yea, I paid about 1/5th of the price of a sump that was just like it, but a mirror image and 4" shorter lol.

I built a simple sump for doing some testing.
Its easy if you have experience; difficult if you dont.

upload_2018-6-25_11-43-9.png

It was definitely a challenge seeing as this was my very first time working with acrylic. I knew basics, you don't glue it you weld it, you have to have clean edges that are perfectly straight, things like that, but never had I worked with this stuff. And holy cow does it make a mess out of your garage!!! WOW lol.
 
You have more going on than I do down there lol. And I see you are running a DCP 10,000 pump. I'm currently running a DCS 10,000 pump on my tank lol. I love that pump! Nice setup from what I can see!
 
Who all on here has actually built their own acrylic sump? I'm not talking about going to the store or some URL and purchasing a sump, I'm talking about you go to a plastics shop, you purchase some flat sheet and you turn it into a sump that fits your needs exactly? I'm just curious because back in April 2013, that is exactly what I did. I have a 90 gallon tank with a single overflow that is offset just enough to make my OCD go NUTZ!!! and I needed a sump to go under it. I had a little 15 or 20 gallon under there with a single 7" filter sock, but only just barely enough room for a skimmer and return pump. I looked online and for the size that would fit under my stand and give me the most volume was something around $400 to $500!!! That was just not going to happen.

So I called up a place here in OKC called Regal Plastics. They have or can get any kind of acrylic you want. I settled on 3/16" acrylic, that's 0.1875" or 4.7625mm for you metric folks. Not very thick, but with the walls in this sump, and the lip I ended up putting around the top it was enough. And going from 3/16" to 1/4" was a HUGE jump in price. I'm talking $40 a sheet! Just a little out of my price range at the time so I went with the thinner stuff and designed my sump to match.

I did a lot of research on what style of sump I wanted and to just do a typical sump with a drain section, refugium section and a return section was just boring to me. So I looked all over the net and found the Trigger Systems Ruby ELITE Sump - 36 inch and loved the design. The price of this sump was right around $450 and that just wasn't going to happen! But even still, they didn't have one that was 40", the max I could put into my stand. So I'm leaving 4" unused. Yes, I could use it for my ATO, but that would be a massive ATO container. I guess I could have used the extra room for dosing containers, but I dose Kalk so I don't need 2 or 3 part. So I settled on the Trigger design.

I grabbed pictures from every angle I possibly could and did a quick layout in sketchup to see it in front of me and decided I liked the setup. It works for what I need, lets build it!

Unfortunately, I didn't take as many pictures as I should have back then but the pictures I did take, well you will get the idea. First up is the basic shape of the sump. It is 40" long, by 15" front to back and 16" tall. This is the absolute MAX size I could fit under my stand because of the support bracing on the sides.

20130406_043843.jpg


Don't worry about the piece sitting on top, it was just a scrap piece I had after playing with the acrylic and building a little Pico AIO tank. I still have it and it still has not seen water lol. Also, you will see that the bottom sheet is slightly oversized. It was way easier to do it this way and then use a router to flush cut it to the sides rather than cutting the bottom to size and then matching the walls to the base.

I did a little more work and this is when things got tough. I had to create a wall that separated chamber 1,2 3 and 4. Chamber 1 is where the water flows from the tank into the sump. It is very small and is only there to let the water come down, then back up and into the filter socks. Chamber 2 is the skimmer section which flows into chamber 3 which is the return section and later in life it also became the reactor section as well with some carbon/GFO. Chamber 4 is the refugium which flows into chamber 2 but has a direct path straight to chamber 3. The inlet to the skimmer is on the far corner away from where chanber 4 flows into chamber 2 so there is NO refugium water getting into the skimmer.

Here are a few pictures of that wall as well as putting up the other walls to make the sump, the sump!

20130407_014301.jpg
20130407_014311.jpg
20130407_014323.jpg


Once the Weld-On 3 cured on this one, it was time to put the top rim on the tank for structural support. Like with the bottom, this is oversized and I used a flush cut router bit to make it fit perfectly. Also in this one you can see the two holes for the dual 4" filter socks. These were a royal pain in the butt to make since they have two different sizes in them so the filter socks can sit IN the holes rather than ON the holes. Allows for less water to pass by them.

20130413_040410.jpg


From here I drilled two holes for the drain into the sump, one hole for the refugium and it was pretty much done. Below are pictures of my old sump, draining the tank, getting the old sump out and the new sump in. I of course did a water test for 24 hours on the new sump before doing this to make sure it was not going to explode when the main pump shut off. It doesn't fill up all the way, but it does get up to about 75% capacity if not a little more. So filling it up to the brim and letting it sit outside for 24 hours in the sun should have caused a failure if anything would. And no, this is not UV resistant acrylic, but 24 hours is not going to hurt it. It's still holding (kind of) to this day over 5 years later lol.


20130414_015231.jpg
20130414_015241.jpg
20130414_015249.jpg
20130414_040656.jpg
20130414_040710.jpg


This was a very temporary setup as you will see and the only reason I had it slid to the right was because the drain from the tank fit perfectly into that right hole in the left side of the sump. I still needed to do the plumbing for this thing.

I did not like having only the refugium light as my only light source under the stand so I installed some adhesive LED's to the top of the under side of the stand and connected them with magnetic reed switches. It works GREAT! They are normally open unlike most other things but what this does is allow the Apex to show Open or Closed if the door is Open or Closed! Little detail, but it works lol. And, I have two switches, one for each door, wired in series so I'm only taking up ONE port on my breakout box.

And yes, that line for the return was being pinched here but this was a temp setup just to keep water flowing while I planned out the rest of the plumbing.

20130418_191333.jpg

20130418_191346.jpg

20130418_191303.jpg


Here you can see the area where the water flows into the sump and then into the filter socks.
20130418_191318.jpg


Here you can see the PH Probe (Blue) and the ORP Probe (Red). If you have questions about, ask someone else. I understand it, I know what it does but explaining it is difficult lol. I have since removed that probe from my system since the probe leaked and was showing off the wall readings. I'm talking into the 700's lol. It's nice to have, but in all reality, is not needed.

20130418_191525.jpg


Here is a picture of my ATO (Auto Top Off) float switch. As you can see, it's a bit low but I'm still trying to fine tune the system for the best water level.

20130418_191411.jpg


Here you can see the water level in the return section. Behind it is the refugim that I will be plumbing in when I get the parts this weekend.

20130418_191420.jpg


Once again, this was from 2013 so all of these pictures are pretty old and if I was just now doing it, I would be taking more pictures lol.

I finally got all of the plumbing done and below is what it looked like with a fresh setup. Yes, I let the glue cure for 24 hours before running water through it.

20130419_112740.jpg


Here is a shot of the return back to the tank. As you can see, there is a bit going on here.

20130419_112800.jpg


Here is a shot of the drain into the sump as well as the return to the tank.
20130419_112821.jpg
Sorry to revive a dead thread, but how is this sump doing now? Still have it?
 
Did you CNC your outer walls too? I had perfect mirror seams on my CNC'd baffles but a couple of bubbles along my outer panels. Advice on how you got that mirror bond on your outer edges would be great
Everything on my sump was cut with my DIY CNC. However I did clean/prep the edges with a acrylic edge scraper.

 

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