The grey stuff that I think you're referring to is "poly-B" which isn't available anymore because of its tendency to break down when carrying hot water, and, as the story goes, is apparently a big problem for those heated basement floors that used polyB and after a class action suit or two the stuff was pulled off the market altogether. Pex is the replacement, it's kind of smoky white opaque. It is available in 1/4", it's just the standard stuff for ice makers, furnace humidifiers, etc.
I have no idea what the coloured tubing is that I see everyone else has (whenever I look at pictures of calcium reactors or whatever), I've never been able to find any of that (not that I've looked really hard ... I know that Rona, HD, and Distiller Depot doesn't have it).
What does a "fluttering sound" sound like. I am trying to imagine this sound but for the life of me I can't imagine ever describing the sound mine makes as a fluttering. More of a groan or a borborygmi (*)
The function is fine, it's just that the noise is a slight nuisance. I wish I knew what I could do to make it go away. Short of putting yet another timer-controlled valve on the whole thing, which is do-able, but a little rediculous (as in "where does this all end" which is a question to be asked while waving your hands in the air and rolling your eyes, just immediately prior to tearing up some more $100 bills and banging one's head into a brick wall and turning on a garden hose and watering your basement carpet. But I digress..)
My RO unit empties into a reservoir behind the tanks. Although it's a solid 20g in volume, the reservoir will empty in 24 hours if I leave the RO off for that long. From the reservoir I have a line which T's off and each end goes into each tank.
Where did you get your shutoff valve from, or more accurately I should ask, who made your valve. Mine is just the one you can get by Kent.
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* How's that for a big word? From Dictionary.com:
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bor·bo·ryg·mus n. pl. bor·bo·ryg·mi: A rumbling noise produced by the movement of gas through the intestines.
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