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Hi :-)
Ph in r/o water is 6.4 - which is good to keep discus :-) and KH about 3 degree
But after 8 weeks the pH going down :-(
My API tester shows 6 - to see lower result is impossible with this tester :-(
I got electronic one which shows 5.4 :-(( !!!!
How to rise up the ph on natural way to...