Best way to raise ph? Kalk?

[Myka]

Did you do Randy's CO2 test that's described in the link provided above? If CO2 is the problem, then trying anything other than reducing CO2 will be fighting an uphill battle. How much calcium and alkalinity are you currently dosing? You may not be able to dose enough kalk to get the pH increase you're looking for. As a sidebar, switching to a calcium reactor will probably lower your pH more. Randy's CO2 test should be step 1 for anyone thinking about messing with pH.