The use of these strips will help you determine how much, if any, additional TRU BLU Salt to add to your water due to evaporation and/or removal.
(Does not test for Bromine) 1. Fill a small glass with one inch of pool/spa water. 2. Insert lower end of strip into water. IMPORTANT: Keep top half of strip completely dry to get an accurate reading. 3. Yellow band will turn dark when test is complete (should take 3-4 minutes). 4. A reading of between 1,900 and 2,100 ppm is recommended.