Aquachek white salt 1 – dip test strips tests for: salt (as sodium chloride). Ideal for customers who have salt generator systems. In just minutes aquachek white nitrators measure salt (sodium chloride) levels from 400 to 7,000 ppm. With appropriate salt levels, you can rest assured that your salt generator will be able to produce the correct amount of chlorine to keep water clean and free of contaminants. To keep you pool water clean and healthy, test the water at two ends or sides of the pool a minimum of twice a week! Pool testing is also advised after heavy swimmer use (i.e party), after animals have been in the pool, after a heavy rain, after fertilizing, etc.