Rain usually just needs a quick pH and chlorine tweak.

Yes, but don’t overthink it. Heavy rain dilutes the pool water, which throws off pH, alkalinity, and chlorine levels. It can also bring in contaminants (dust, pollen, grass).

Test the water first. Most likely you’ll need to raise your pH (rain water is slightly acidic) and add chlorine to shock it. Alkalinity might drop too — adjust that before pH. If the pool is overflowing, you might need to drain some water to keep the skimmer working.

But no, you don’t need to drain and refill. Just test, adjust, and run the pump longer that day. Your biggest enemy is algae, not rain.

Think of it like a quick tune-up, not a rebuild.