DOS tubing?
- Thread starter MSB123
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OP
OP
MSB123
Someone out there put something smart here.
I have a weird house.
I got the dos for my clownfish breeding tank (14 gallon). I will change 8 gallons a day from my DT and then pump it back into my DT.
The DDR is for once I get the bigger tank for my clowns and I will use the DOS for 2-part.
OP
OP
MSB123
Someone out there put something smart here.
I got 2. One for 2-part, one for AWC.
Let me make it less confusing.
I have 2 DOS coming.
One is to change out 5 gallons a day from my DT and put in fresh SW.
The other DOS is for changing 8 gallons a day to and from the 14 gallon clown tank.
After I get a bigger tank cycled for the clowns, I will use the dos that I was using for the clown tank to dose 2-part.
Ahh I get it. 200 ft of 1/4 ID is 1/2 gallon; I dont know if that plays a role in your calculations, but the 14g will not be getting "fresh" water if you are doing it throughout the day. Still will need a heater and such.
OP
OP
MSB123
Someone out there put something smart here.
Yes. I know. It is a full set up tank.
I am doing the water changes because 2 clownfish in a 14 gallon tank is too much for the bio load capacity of that tank
OP
OP
MSB123
Someone out there put something smart here.
I have a 200 watt heater in the tank.
U
User1
Guest
Thanks all for the answers 
I use standard 1/4” RO, heat the end in hot water and push over the fittings, then tighten n
I use standard 1/4” RO, heat the end in hot water and push over the fittings, then tighten nut. It’s very secure. I was planning on the cool conversion you did but decided I didn’t need it.
I use standard 1/4” RO, heat the end in hot water and push over the fittings, then tighten nut. It’s very secure. I was planning on the cool conversion you did but decided I didn’t need it.
That’s what I was gonna do too, but I’m a nerd that likes to tinker for the sake of tinkering so I did the mod.
The bigger reason is that I have the DDR as well and the DOS soft tubing notoriously leaks air through the John Guest quick connect fittings for the DDR. It’s quite the head scratcher why Neptune didn’t use common fittings for both the DOS and the DDR.
stacksoner
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Putting the entire length of tubing in a pot of hot water for 5 seconds takes away all of the headaches.
Tastee
Valuable Member
I did the same as you when I installed mine about 14 months ago and a few days ago checked the fittings and found I could tighten them about 1/2–3/4 turn each, so it is worth keeping an eye on them. I doubt they loosened, but the dosing line probably shrunk in thickness a little over time.
Waters
"...in perfect isolation, here behind my wall."
I purchased these https://www.amazon.com/John-Guest-Speedfit-PP450821W-Adapter/dp/B003YKF256/ref=sr_1_1?ie=UTF8&qid=1547727671&sr=8-1&keywords=John+Guest+Speedfit+PP450821W+1/4OD+by+1/8NPTF+Female+Adapter,+10-Pack and am using RO line rather than the flexible tubing. Haven't turned it on yet but based on research seems to eliminate all the issues associated with the current fittings.
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Here’s the upgrade process with pictures on the Neptune Forum...
https://forum.neptunesystems.com/showthread.php?13511-RO-tubing-to-DOS-connection
https://forum.neptunesystems.com/showthread.php?13511-RO-tubing-to-DOS-connection
jccaclimber
Active Member
I went ahead and measured my tubing the other day. Measurement tool was a couple month old pair of 8" Mitutoyo digital calipers (with the NIST traceable cert). Tubing was put nearly parallel to the jaws along with a light touch to avoid ovalling it as much as possible.
The orange Neptune tubing measured 0.248".
The clear BRS hard tubing (looks like hardware store refrigerator water line) measured 0.245".
The BRS soft line (looks like vinyl aquarium air line) measured 0.245".
Sadly I didn't think to measure the RO line at the time and my calipers are not with me currently.
In my mind my orange Neptune line was closer to 1/4" than it was to 6 mm, although it could just be a batch running on the large end of spec.
For the DOS application you could always put a push connect coupler on a short length of the orange hose (the 1/4" ones from Lowe's seem to work fine on my Neptune hose), then couple that to whatever you want. Not as clean looking, but no DOS modification needed.
The orange Neptune tubing measured 0.248".
The clear BRS hard tubing (looks like hardware store refrigerator water line) measured 0.245".
The BRS soft line (looks like vinyl aquarium air line) measured 0.245".
Sadly I didn't think to measure the RO line at the time and my calipers are not with me currently.
In my mind my orange Neptune line was closer to 1/4" than it was to 6 mm, although it could just be a batch running on the large end of spec.
For the DOS application you could always put a push connect coupler on a short length of the orange hose (the 1/4" ones from Lowe's seem to work fine on my Neptune hose), then couple that to whatever you want. Not as clean looking, but no DOS modification needed.
That's what I've been using and it has worked well. It can be a bit difficult to get onto the DOS head but as long as you press the tubing in hard while tightening it down, it works. I know some people will soak the tip in hot water before to give it a bit more elasticity. Just be careful not to wiggle the connector back and forth too much because the DOS connectors crack easily.
Not sure, I've only used the 1/4" tubing from HD, and RODI tubing from online vendors. The Neptune DOS tubing fits the connectors well but it is a pain to work with.
Some people have actually added 1/4"x1/8" female adapter push connect fittings to their DOS pumps so that they can just push RODI tubing into the connectors instead of having to shove it on to the DOS fitting. I'll likely be doing that in the near future as well.
