One cool benefit—you’ll know it’s time to replace one or both of the cartridges when the dispenser turns on its side. Frog makes onespecifically for soft-sided poolsin addition to their regular one, so if you have an above ground or Intex pool, you can still get in on the mineral...
Collect a water sample; your test kits should come with a collector. Add the recommended number of drops of phenol red to the water on the pH side. Add the recommended number of drops of OTO to the water on the chlorine side. Hold the collector up in front of a white background, and...