Aqua vega does drop the ph but it stabalizes and doesnt move for weeks for me. Try this which is what I did and worked great. take a gallon of un ph'd water and add your part a and b at whatever application rate 6 ml a gallon of each for me for example. Measure your ph again after this and see how much it drops.... If it drops from say 8.0 to7.0, then you know to ph your water to 6.8 instead of 5.8 before adding your chemicals. Once I figured theright mix it has been super stable.