RO/DI pressure question

[sowellj]

I am currently in the planning phase for 180. My house/loft is a coverted school cafeteria and has cinder block walls. Needless to say that is not the friendlies of materials for routing tubing/plumbing. I was thinking of running the RO/DI unit adjacent to the washing maching, but this would entail running the output line through roughly 20 feet of tubing and up an 8 foot elevatuion gain. I am thinking of getting a 75 gpd unit. Would the output pressure of the unit be able to push flow through the extra plumbing. Alternately, I can place the RO/DI unit near the aquarium (use house water pressure to get water to the unit), and use the output line of the unit to push the water back to the washer (waste drain). Clear as mud? Any ideas or suggestions would be greatly appreciated. Thanks.

 

[cmm1970]

You are most likely going to have to install a booster pump so that you can drive the membranes to specification. It may work without, but if you measure the rejection rate on the membranes while in use with the back pressure from running the waste line such distance, you will likely find that you have compromised the performance of the membrane. The booster pump will let you run the unit at a pressure that ensures the rejection rate you expect from your unit.

 

[Mike in AZ]

I would be more inclined to have a 40 gallon Brute trash can next to the unit and a little giant pump or something to pump the water to where you want it to go. I wouldn't mess with putting backpressure on your RO/DI system.

 

[Jay180reef]

Put the RODI at the highest level possible. I would recommend keeping it simple.