How Do I Lower pH in My Pool?

Quick answer: To lower pH, add pool acid (muriatic acid or dry acid) in small doses as the label directs, let it circulate, and retest. Check alkalinity first, because high alkalinity makes pH drift upward.

Why pH keeps rising

• Salt chlorine systems
• New plaster
• Waterfalls and aeration
• High alkalinity

What to do

• Test alkalinity and bring it to about 80 to 120 ppm first
• Add a small dose of acid with the pump running, away from the skimmer
• Wait for circulation and retest before adding more
• Aim for about 7.4 to 7.6
• Add acid to water, never water to acid, wear eye protection, and never mix chemicals

When to call a pro

If pH climbs every few days, a pro can check alkalinity, your salt system, and your water source.