HTH
"HTH(TM) stabilizer, 4 lbs., helps to protect and extend the life of chlorine in swimming pool water. It slows the loss of chlorine caused by sunlight. Use this product if sunlight makes it difficult to maintain the correct chlorine level. "
HTH 3 Lb. Large Single-Use Floater Chlorine Dispenser
General Foam Plastics 5' Round Wading/Swimming Pool
HTH pH Up: Spa pH Increaser
HTH™ Pool Care Algae Guard+ Ultra
HTH™ Pool Care Clarifier Advanced
