DIY RO system and res question

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So since I grow hydroponics I got an RO system that I attached to a trash can I use as a reservoir with a float valve and the wastewater line going down the washing machine stand pipe(pretty sure that's what its called). Well I just assumed when the tank was full and the float valve cut it off the waste water would naturally stop too since its no longer flowing through the filters. I was wrong and got a little surprise on my water bill. God only knows how many hundreds of gallons I wasted. This is the only RO system I have ever used. Is this normal or do I just have a cheap RO system? Has anyone else experienced this and found a decent work around? I can always just go back to setting timer for 30 minutes a gallon but I'm trying to find something that takes place independently of myself.
 
I don't use a float, but I just went out and turned my system on. With the valve open on the RO outlet, I have waste water flow. If I close the valve on the RO side, the waste stops after about 5 seconds. Even in backflush, waste stops when I shut off the RO outlet. Sounds like you've got a bad valve in there somewhere.
 
I don't use a float, but I just went out and turned my system on. With the valve open on the RO outlet, I have waste water flow. If I close the valve on the RO side, the waste stops after about 5 seconds. Even in backflush, waste stops when I shut off the RO outlet. Sounds like you've got a bad valve in there somewhere.
It was a cheap unit that is no longer cheap with all the waste. I'm starting to wonder if there was a valve in there at all.
 
The cheaper an RO system, the slower it is, and the more water it wastes.
Like Arthur, I turn faucet on and off by hand.
I think it takes a special float valve to turn off a faucet remotely.

Don't beat yourself up. That was a one time event.
It's easy to fill it manually.
Installing a spigot near the bottom of the trash can helps a bit.
 
The cheaper an RO system, the slower it is, and the more water it wastes.
Like Arthur, I turn faucet on and off by hand.
I think it takes a special float valve to turn off a faucet remotely.

Don't beat yourself up. That was a one time event.
It's easy to fill it manually.
Installing a spigot near the bottom of the trash can helps a bit.
Yeah, I just decided to go back to using a timer and just rely on the float valve to prevent another over flow. Instead of replacing the filters in this RO system I will just get a good one in a couple months. There is one made by Waterdrop that they claim produces 2:1 pure:waste but its like $360.
 
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