RO/DI System Questions

[msl5078]

Hi everyone,

I just picked up a 75GPD OR/DI system off someone tonight. It currently has six stages with 2 horizontal DI chambers. I am in the process of converting it over to a 5 Stage with 1 micron sediment filter, 1 micron carbon block, and a vertical DI chamber. Currently I am getting a 4:1 ratio as you would expect. Would adding another 75GPD membrane and increasing the pressure to say 90psi-100psi get me using less water? I would like to get a 2:1 or even a 1:1 ratio if possible. Trying to save water and $$$ on the water bill.

Also does anyone know if you can set the pressure on the Aquatech 8800 series pumps. I know you can adjust the pressure bi-pass but I have'nt heard of being able to select overall pressure. I was thinking a simple valve could be used to control pressure by restricting flow.

Thanks,
Mike

[disc1]

Originally Posted by msl5078

Hi everyone,

I just picked up a 75GPD OR/DI system off someone tonight. It currently has six stages with 2 horizontal DI chambers. I am in the process of converting it over to a 5 Stage with 1 micron sediment filter, 1 micron carbon block, and a vertical DI chamber. Currently I am getting a 4:1 ratio as you would expect. Would adding another 75GPD membrane and increasing the pressure to say 90psi-100psi get me using less water? I would like to get a 2:1 or even a 1:1 ratio if possible. Trying to save water and $$$ on the water bill.

Also does anyone know if you can set the pressure on the Aquatech 8800 series pumps. I know you can adjust the pressure bi-pass but I have'nt heard of being able to select overall pressure. I was thinking a simple valve could be used to control pressure by restricting flow.

Thanks,
Mike

There is a restrictor in the line behind the RO membrane in the waste line. It works exactly the way you are thinking. Increasing the pressure further will have little effect.

You can add a second membrane to reduce some on your waste water, but you're not going to get down to the ratio you want. Not without giving up water quality anyway.

Also remember that no matter how you restrict the flow, there is a limit on pressure. You will never get the pressure higher than the pressure from the tap without a booster pump. That is a function of your pipes and how high the water tower is above your house.