I do both full and particial changes depending on the system and circumstances. I have pretty high PH in my well water so if I don't have enough RO water I do a particial change unless there is something nasty in the nutes. I don't know why my RO water has lower PH but it does. I've tested it several times with the drops both before and after and it goes from 8 to 6.5ish every time. I have to use lots of ph down and still have my untouched bottle of ph up from my first kit. I am going to build gpsfrontiers water filter system and see how that goes.
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