RO/DI discharge pressure

I am a complete novice to RO/DI. I bought a system and it comes in on Tuesday. I've been reading about how they work / how to install them and it didn't occur to me that it would have a discharge line. :-X

Problem:
I was going to hook the RO/DI up in the canopy of my tank, saving filtered water into a holding compartment down by the sump. I have a pressurized water line behind my tank for this purpose.. but I don't have the sewage line / drain near the tank.

Question:
Could I run a plastic line to the nearest bathroom and hook it up there? It's about 10 feet away... The line would have to travel about 5 feet down to go under the house and travel another 3-4 feet upwards to level with the sinks trap. I wasn't sure if this was possible because it seems that the discharge line has little to no pressure.

Any help or advice would be appreciated
Mark

p.s. How much discharge is produced per 1 gallon of filtered water... typically?

 

In the summer I hook mine up to a garden hose that is 100 feet long and water pressure works just as good as in the sink.

 

When you change the configuration of the waste line, you change the waste ratio. You will want a capillary tube flow restrictor such as Spectrapure and Buckeye Field Supply use in their systems and measure and trim it for your 4:1 waste ratio once you have everything installed. Adding to the waste line usually results in reducing the waste and shortening the RO membranes useful life so changing the flow restrictor will get it back to 4:1.

 

Just to clarify...

Thanks AZDesertRat. So if the RO/DI claims to produce 75gph, it would produce (with the proper capillary tube flow restrictor) about 18-19 gallons of waste?

 

I thought it was the other way around, more waste than product.

AzRat will enlighten us

 

The brine or waste is 4 times the permeate or treated flow.
4 waste to 1 treated so 300 gallons of waste and 75 gallons of good. This is necessary to keep the membrane flushed and carry the concentrated TDS from the treated water away. If you test the waste with a handheld TDS meter you will find it is 20 to 25% higher than the tap wate rwas to begin with since it contains the TDS for 5 gallons concentrated into 4 gallons.

 

Thanks for your help, AZDesertRat. I wouldn't have known ... :-/

Last question... I promise!

For some reason I think my discharge line would never make it to the drain by my sink since it has to travel about 10 feet. Would it be unwise to just run a line into a makeshift drywell outside my house?

This whole discharge topic has me worried. Thanks so much for your input.

 

The waste line will make it that 10 feet no sweat, you will just want to measure the waste ratio once installed though and adjust if necessary. It can travel hundreds of feet horizontally and 20 or 30 feet vertically if necessary as long as you account for it by adjusting the flow restrictor. If you have at least 50-60 psi tap water pressure you will have no problems.

 

Thank you a ton, AZDesertRat!