Originally Posted by Douglas.Curtis
Brilliant! Thank you for sharing this.
What type of r/o unit are you using? I've used a stealth-100 RO for years now and it shuts off completely when you close the output valve. A float valve does the exact same thing.
If you're using a booster pump, there are ones which have a backflow sensor. They shut off when the output of the r/o machine shuts off.
Not currently in use, and the R/O unit itself has sat dormant long enough, still in its original place on the basement wall, that I'm hesitant to use it, as I fear what array of fungal critters might've grown in the chambers over the last 12-16 years since it was last used.
That said, I got it from an older gentleman in Indiana, off the internet, from a search of one sort or another, and he was selling 'portable R/O units for salt water reef aquariums' (as in, set up to connect to a threaded hose-bib or faucet, which was what I wanted).
The shut-off valve is still in the box he sent to me back then, a year or 2 after the initial purchase of the portable R/O unit, complete with hand-written tags on each inlet or outlet, along with 1 pre-filter and 1 post-filter cartridge he sent back then.
I have a Kinnetico R/O unit in the kitchen, but it's hooked up to the main water angle-cock beneath the kitchen sink, and has the fancy chrome tap/faucet with it, and small-ish pressure tank, with no option for taking it to the basement, and I've not had any desire to have a pressure tank attached to anything geared for indoor gardening, and lack knowledge about how to make such a configuration work for me.
Another established forum member referenced the iSpring R/O D/I units, and stated he has run one of their 5-stage or 6-stage units with the re-mineralization option.
But further research revealed that their re-mineralization models come with a prop 64/Prop 65 (??) warning from California's environmental compliance folks, and when that particular buyer inquired with iSpring's folks about "Why the warning? What's in your unit that triggers this warning?" they allegedly wouldn't tell him. That, and the iSpring units I found all seem to come with a tank, and that's not the set-up I need for my basement utility sink's tap.
So iSpring hasn't caused me to order one of their units right away.
Still shopping for a reasonable unit that does a good job, doesn't need to re-mineralize (though I'm somewhat open to that, depending), and would love to use a valve that doesn't add to the already outrageous waste water flowing down the drain.
Though I figure the valve I have now, new in the box still, even if it sends excess water down the drain, is really only to function for those times I fall asleep before the water can reach its proper level, and until I get up and to the basement at what ever time of day, to shut off the supply to the unit.
But my TDS is up around 380 +/-, straight out of the well, with lots of calcium carbonate in the otherwise clear & excellent, no-odor, no-taste well water.