Chlorine demand climbs fast
Higher water temperature accelerates every reaction in the pool, including the ones that consume chlorine. Add longer swim sessions, sunscreen, and sweat, and demand can double compared to April.
Evaporation concentrates everything but chlorine
As water evaporates, calcium hardness, salt, and total dissolved solids rise while the volume drops. Then you top off with hard Hill Country fill water and push calcium higher still.
That combination is how pools drift into scaling territory in August without anyone adding a thing.
Run time is not optional
Filtration and circulation are what let chemistry work. Cutting pump run time to save on electricity during the hottest weeks is the single most common cause of an August algae bloom.
