There are several test methods available through your local pool and spa dealer. These include drop tests or strips. Either method is fine as long as it measures the following four parameters; pH, total alkalinity, total chlorine and free chlorine or bromine. Most test kits will state that 0.5 ppm chlorine or 1.0 ppm bromine is too low but it is the ideal range when used with FROG minerals. (See FROG Test Strips) Bring a water sample to your dealer occasionally to ensure water balance.