RO/DI Unit Wasting So Much Water! Normal?

[Fishnthecorner]

expected gpd = rated gpd × pcf × tcf. Pcf is the pressure correction factor. Tcf is the temperature correction factor. On a 75 gpd membrane with a pcf = line pressure (in psi) ÷ 60 of .63 (38/60) and a tcf (60.8 f = 0.754) so 75 x .63 x .754 = 35.6265 gpd. The math does not lie. I assume your on well water with a 38 psi rating and well water in winter months in my area are around 52 so you will need a booster pump to help. And yes you will have more waste water due the increased viscosity of water at a colder temp. Double check you 4:1 ratio for winter and summer application. My 300 gpd unit only puts out 225 gpd on city water in winter months 60 f water but i get 450 during summer time. Water is like 75 f and my pressure is 100 psi (booster pump).

holy bleep!

 

[Fishnthecorner]

If you have one, it should be on the water water line after the membrane. Do you know if 38psi is normal output?

It's hooked up directly to a 3/4" main hose line. 38 is all i get. It's not well water... It's city water. I let it run for 25 hours straight, and it made less then 30 gallons, and it must have wasted a swimming pool.

If the flush valve didn't come with the system i purchased from BRS, then I don't have one... Do I need one?

 

[solitude127]

It's hooked up directly to a 3/4" main hose line. 38 is all i get. It's not well water... It's city water. I let it run for 25 hours straight, and it made less then 30 gallons, and it must have wasted a swimming pool.

If the flush valve didn't come with the system i purchased from BRS, then I don't have one... Do I need one?

The reason I ask about the flush valve is because if it's left on, it'll drop your PSI and if it's closed, it'll be your true PSI. If you did get the plus kit, then it should have one. I'd check to make sure it's closed.

 

[Plato]

Check house pressure. If it not 60 then the city supply has a pressure reducing valve you can adjust.

 

[Fishnthecorner]

Check house pressure. If it not 60 then the city supply has a pressure reducing valve you can adjust.

House is at 38 as well... Where is the city supply pressure reducing valve???

 

[Fishnthecorner]

The reason I ask about the flush valve is because if it's left on, it'll drop your PSI and if it's closed, it'll be your true PSI. If you did get the plus kit, then it should have one. I'd check to make sure it's closed.

ok, I just checked, and yes I do have a flush valve on the back of the unit. I turned it (to flush) and then turned it back off, and now I have 32psi... Geeez

 

[captnslapy]

Just to be clear... When you guys say "4:1", You mean 4 parts waste : 1 part RO/DI Correct?

Capnslappy: How do you save and use the waste for your washing machine?

I have my system mounted next to the washer and I have my waste water line running into the top of the washer. My water days go along with my laundry days. Fill up the washer and wash clothes.

 

[aandfsoccr04]

I didn't know the water temperature or the flush valve have any effect on how much RO/DI water you will get compared to waste water. Interesting...I better turn my flush valve off..

 

[aandfsoccr04]

well wouldn't you know, as soon as I closed the membrane flush lever, my PSI went up about 20. I'm such a goon, I swear you learn something new everyday in this hobby.