Get Alkalinity, Calcium, and Magnesium test kits. Only dose what you are testing for. Directions are on the chemicals, but do not use the bottles of Kent or similar. You want the BRS or B-Ionic stuff. Those are in bulk and you go though a lot, so stick to the bulk quantities. B-Ionic is better than BRS. They say the BRS is pharmaceutical grade, but there is no way that's true, its got crap in there that might grow algae.