Keeping the pool and spa clean with pool filters and pool cleaners is only part of the process for ensuring the healthful enjoyment of pools and spas. The ongoing treatment and chemical balancing of the water is a requirement, as well. Ensure perfect water with our pool and spa chemicals. Select from chlorine, algaecide, shock, clarifier, and pool enzymes in tablet, liquid, concentrated liquid and granule forms. Items also vary by size and other considerations.