resevoirs

does anyone use a resevoir for their water ? my tap water is around 7.8 ph and am having to ph every watering i tried to ph my whole resevoir of water but it seems to go back up after a day or two ? any ideas or just keep ph'ing every watering ?

i am using vinegar to lower my ph might this be it ?

should i just get some ph down or is it just an expensive acid solution ? ?

when i was setting mine up I made a decision. You could spend $150.00 for a good ph tester, or $200. for a reverse osmosis system. No more ph problem. YOu will need to have a drian with a ro system. 5-1 ratio good water to waste water. Everything you have, pumps, lines, resevoirs etc. will stey cleaner. Just my humble opnion. VV