My house has well water and a reverse osmosis system for drinking water. The water for the RO system is plumbed through a prefilter, an automatic shutoff valve, the RO membrane, through the other side of the automatic shutoff valve, then tees off to a pressure tank and to a postfilter, then from the postfilter out to the drinking water faucet. It's all 1/4" PEX with push fittings. The filters and tank are located directly below the sink close to the crawl space floor; it's about 10' from the faucet to the crawl space floor.
I would like water to exit the drinking water faucet faster. What's my best course of action?
- Move the pressure tank to be after the postfilter instead of before?
- Add another pressure tank after the postfilter?
- Use larger diameter plumbing and faucet?
- Something else?
One thought that comes to mind about option #1 is that the automatic shutoff valve would then turn on the water supply immediately every time the faucet is turned on (assuming sufficient pressure drop across the postfilter), not just when the tank pressure is low. I don't know if that would be bad for the lifetime of that valve.
At some point I'd also like to get more filtered water to come out before it peters out. That obviously requires a larger pressure tank. I guess I'm mentioning that only to say option #2 doesn't sound like a waste of money to me: I could just buy a large pressure tank now instead of later and put it there. But I'd also be fine delaying that expense if I can get better flow rates for cheap.
And my faucet is leaking so I'll probably be replacing it soon. (It's a non air gap version, so I don't think the leak is serviceable) So #3 doesn't sound like a waste of money to me, either, in the sense that I'll be getting a new faucet anyway. I'm just not sure if my plumbing dimensions are more restrictive than my postfilter.
P.S. I'm asking about initially higher flow rates. I'm not interested in increasing my filtering capacity at this time.