Usually when using a net acidic sanitizer (trichlor, dichlor, bromine tabs, MPS) then you do want a higher TA, usually in the range of 100 to 120 BUT if your pH is constantly rising (and you don't have new, curing plaster less than a year old) then your pH rise is from outgassing of CO2 and you want to lower the TA. If you lower the TA and are using a net acidic sanitizer (trichlor, dichlor, bromine tabs, MPS) then you want to monitor TA weekly and pH daily or every other day so the pH does not crash suddenly. You do not want K-2005, you want a K-2006. Everything is the same EXCEPT for the chlorine test and there is a world of difference.