I had new taps fitted all nice and clean so I deliberately let the cold tap drip. After 10 days this was hanging off the tap, not only that but there was a build up of moldy snot looking stuff round the plug hole. I have a hard time keeping my reservoir clean. I've put a submersible fish tank filter in the reservoir which I clean every now and then. I keep the res dosed up with zone, plant is very healthy. I just don't know what that snot stuff is.
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Uh, pH is rock solid stable with r/o. Using nutes incorrectly will burn roots, causing a sharp drop in pH. Not the water, the user.it loses nothing (unlike RO) and does not give you yoyo madshit pH problems like (pure) RO