RO/DI without overflow

[PokerG]

Are there any RO/DI units that work without water overflow?

I guess the principle is that the water mains pressure forces the water through the system and the 'dirty' water overflows into a drain or similar. Was wondering if there is a system that doesn't have a drain away? Unlikely I know...

Alternatively, how difficult would it be for me to plumb the system so my topup tank when full stops the water entering the RO unit? As it stands I am using floats in the topup sections to stop the flow of water from the RO unit but this doesn't stop the overflow going 24h a day.

Thanks in advance,

Gary

 

[DerekW]

You need a solenoid to shut off water to the ro when the float valve stops the flow.
something like this:
http://www.seaquestmarine.com/product_km_sok.htm

 

[bhdmc]

Not for the RO/DI units. The Tap Water Purifier has no waste water. Can't tell you how well it work, only read about it.

 

[PokerG]

Thank you both, I think I will go for the RO cutoff kit. I have something similar now and may be able to adapt it. The water tap purifier probably would be a little much to maintain as its a large tank, lot of evap and I have very hard scaley water that would eat through the cartridges.

Gary