Run the pump 24/7 during a heatwave.

Yes, you need to run the pool pump continuously during a heatwave. It’s the single most important thing you can do.

Algae loves warm, stagnant water. A heatwave turns your pool into a breeding ground. By running the pump non-stop, you keep the water moving and the chlorine circulating. That alone stops most algae outbreaks before they start. I’ve seen pools go green in two days of reduced pump time.

Brush the walls and floor daily, too. Even with the pump running, algae can cling to surfaces. A quick brush breaks up any early colonies so the filter catches them. Also shock the pool every five to seven days during the heatwave — the sun burns off chlorine faster than you think. Keep your