I have an idea that I need some feedback or critique on. I have an existing 3 stage (+ taste) with a 4g holding tank in the basement that feeds the fridge and sink tap, with another 4g tank below the sink. The system is around 20 yrs old, the basement tank is original (and probably has a bad bladder) and the sink tank is about 8-10 yrs old. It has poor capacity and no shutoff valve, and probably a high dump ratio.
So here's what I'm thinking of doing, I'm going to buy this
and hybrid the 2 systems together. I'm going to throw the older 2-stage prefilters away and use the new 3 stage, then split the output to both RO
membranes, like this
And add the auto-shutoff around the old filter/tank system.
My idea here was that I don't want to drain out the tank system on the household side when I fill up the Brute can (or when I empty it out to do a PWC
). I figure this way, one system for the house, one system for aquarium water, and they both run off the same pre-filter block.
From my understanding of RO
systems, you have high pressure on the supply side that would prevent backflow through the membrane, but if I connect 2 RO
membranes feeding separate systems from the same supply line, is there any possibility of backflow? For instance, if the household tanks are full and that system is shut off via the auto-shutoff, and I drain the trash can so that the aquarium system is now in full-production, is there any possibility of the tank system backflowing through the household RO
membrane? I figure it wouldn't and if it did, it would only be enough to lower the pressure to match and then it would stop. But I figured it was worth asking.
Any other observations or comments welcome.