New to RODI filter can someone assist pls

[CornishCrustyCorals]

I'm just setting up my first ever RODI unit.

Got the first 3 stages plumbed in and the kit I bought said to run the water through them for 15 mins to flush them out.

Out of curiosity I tested the TDS.

The TDS out from the first 3 stages (before the RO filter) is exactly the same at 63.

Do they not reduce the TDS at all normally? or is it because my water is fairly low anyway that the next stage should get it down lower.

I still need to add the last few stages and will test again hoping it gets down to 0.

 

[tzabor10]

I'm just setting up my first ever RODI unit.

Got the first 3 stages plumbed in and the kit I bought said to run the water through them for 15 mins to flush them out.

Out of curiosity I tested the TDS.

The TDS out from the first 3 stages (before the RO filter) is exactly the same at 63.

Do they not reduce the TDS at all normally? or is it because my water is fairly low anyway that the next stage should get it down lower.

I still need to add the last few stages and will test again hoping it gets down to 0.

What brand did you buy? Model?

 

[reeftivo]

I'm just setting up my first ever RODI unit.

Got the first 3 stages plumbed in and the kit I bought said to run the water through them for 15 mins to flush them out.

Out of curiosity I tested the TDS.

The TDS out from the first 3 stages (before the RO filter) is exactly the same at 63.

Do they not reduce the TDS at all normally? or is it because my water is fairly low anyway that the next stage should get it down lower.

I still need to add the last few stages and will test again hoping it gets down to 0.

what kit do you have? Pictures?

i assume you have a prefilter, a carbon cartridge, a DI cartridge and an RO membrane.

if the water isn't passing through the RO membrane you'll still get TDS.

 

[Reef By Steele Verified Sponsor]

The first three are probably sediment filter activated carbon and maybe a cartridge or such. TDS will not come down a lot until it passes through the membrane and the DI cartridge.

 

[Sisterlimonpot]

Agreed, the pre-filter are there to remove chlorine so to not damage the membrane.

The membrane is what begins the process of rejecting TDS. Then the post DI cartridges remove the remaining.

 

[CornishCrustyCorals]

I just finished setting it up I'm getting 0 after the RO and DI sections

I went for a Aquati 5 stage 150gpd I am extremely limited on room and just plan on doing around 10-20 gallon water changes a day and it seems to be flowing through pretty quick compared to what I thought it was going to be.

 

[Serpentman2024]

Like others have commented, the first stages will do little to remove TDS. The membrane does all the heavy lifting removing the majority and the DI polishes what’s left.

 

[CornishCrustyCorals]

I was a little bit concerned but I assume people with like 300 TDS from the tap will notice it coming down more. before or do people just not care about it before and just changed them regularly?

 

[CornishCrustyCorals]

also I was thinking about T'ing off before the resin and adding a valve so I could use it for clean drinking water and then closing it for when I want RODI for the tank or is that not a good idea?

 

[KrisReef]

I was a little bit concerned but I assume people with like 300 TDS from the tap will notice it coming down more. before or do people just not care about it before and just changed them regularly?

RO should remove at least 90% (or greater) of the TDS when it is working properly. At initial TDS of 300 (x .9), the filter should remove 270 tds leaving 30tds or less for the DI resin to deal with. If the RO isn't removing at least 90% then something is wrong with that stage, ime.

I have 300+, sometimes up to 600 here in southern CA so a good membrane is important to remove at least 95%, even up to 98% if you get a good working membrane and then the resin doesn't get ruined after making 30 gallons.

Your speed. 150 gallons/day/ 24 is like ~6 gallons/hour which is nice when you need to make up a bucket of salt water of top off water.

 

[CornishCrustyCorals]

yes I timed it last night on my first 5 gallons it actually took me about 2 hours but that might be to do with my water pressure.

Either way I'm happy with it.