How much waste water does a RO unit produce?

[MitchM]

Temperature makes a big difference too.
I had an inline thermometer on my household water supply just before the RO unit.
In the winter, sometimes the incoming water temp was below 5 C!
The RO membrane rejection rates (and GPD) are also based on an incoming temp of 23 C.
The colder the temp, the higher the rejection rate.
I have heard of some setups supplying the RO unit with a mixture of hot and cold water.

Mitch

[sphelps]

I have a vertex which is suppose to be 1:1 but I've never checked so I doubt it. If you're concerned about wasting water many people store the waste water and use to for other purposes. If you can find a use for all the waste water then your ration will be zero.

[cale262]

Originally Posted by MitchM

...I have heard of some setups supplying the RO unit with a mixture of hot and cold water.

Mitch

Sounds like a great idea...I think I'll try that, just need another saddle valve and a T.

[cale262]

Water is cheap though,...All you have to do is tap it before your meter, not that I'm doing that...