Where we mention Clorox Pool&Spa Swimming Pool pH Up, Raises pH, Protects Against Eye and Skin Irritation, 4LB

• Weekly Pool Care: Your Maintenance Schedule and Checklist

  pH adjuster — raise · Best for: Raising pH when it drops below 7.2 after acid or rain

• Pool pH: What It Is, How to Test It, and How to Raise or Lower It

  Standard pH increaser · Best for: Routine low-pH corrections

• Pool Eye and Skin Irritation: Causes and Water-Chemistry Fixes

  Best pH-up option · Best for: Sodium carbonate for raising pH without raising calcium.

• How to Lower Cyanuric Acid in a Hot Tub

  Job number one after the refill — fresh water has zero alkalinity · Best for: Fill water arrives with no total alkalinity at all. Nothing sanitizes in unbuffered water, so pH Up goes in first and sanitizer goes in last.