What RO/DI Unit?
 

I used to use a Osmotics Ultra-Pure unit but don't seem to be able to find them in this part of the World.

What RO/DI units are you guys using?

What's the 'loss' per gallon on the units you use?

http://cgi.ebay.ca/AQUA-SAFE-MAXIMUS...ayphotohosting

This is what i use 100gal/day unit, dont know about water loss though. i think 3 to 1.

I use the AquaFX Barracuda 4 stage 50 gpd RO/DI unit. My tap water is 50 psi and 92 tds, I get 1 ppm tds out of the RO cartridge, and 0 tds out of the DI cartridge.

Filmtec 50 gpd = 98% rejection rate
Filmtec 75 gpd = 98%
Filmtec 100 gpd = 90%
BFS 150 gpd = 98%

Which means that if you have a 100 gpd unit your DI resin will burn out quicker since the rejection rate is 90%.

From what I understand, a typical unit will have a 4:1 waste water production. I haven't measured mine, but that seems about right.

I've got an aquasafe unit and love it.

About the loss, it depends on your incoming pressure and also the water temp, if it's too cold, you end up wasting a lot of water, same with low pressure.