HTH pH Down Pool pH Reducer 5 lb — Fast-Acting Formula for Stable pH & Better Chlorine Performance

HTH 67057 pH Down (5 lb) is a concentrated pool pH reducer designed to quickly lower and stabilize pH for clearer water and better chlorine performance.

Maintaining correct pH is one of the simplest ways to protect your pool surfaces, equipment, and swimmers’ comfort. The HTH 5 lb pH Down formula reduces high alkalinity-related pH so chlorine can work more effectively and scale formation is minimized. Use it as part of a weekly testing routine—HTH recommends aiming for a pH between 7.2 and 7.8 for optimal results.

How quickly will HTH pH Down adjust my pool’s pH?

This product is formulated to act promptly when applied according to label directions, allowing for fast correction of high pH. Changes depend on pool volume, current pH, and total alkalinity, so small, measured doses are best to avoid overshooting the target.

• Add small amounts, retest after 30 minutes to 1 hour, and repeat as needed.
• Five-pound container provides multiple treatments for typical residential pools.
• Compatible with all pool types—vinyl, concrete, fiberglass—when used as directed.

Will this help my chlorine work better and reduce scale?

Yes. Lowering high pH brings water chemistry into the ideal range where chlorine is more active, improving sanitization efficiency. Balanced pH also reduces the tendency for minerals to precipitate and form scale on surfaces and equipment.

• Improves chlorine effectiveness by shifting pH into the recommended range (7.2–7.8).
• Helps prevent scale and staining associated with high pH and hardness imbalances.
• Reduces swimmer irritation caused by improper pH levels.

How do I use HTH pH Down safely and correctly?

Always follow the label directions for accurate dosing. Test the pool with reliable test strips or a test kit, broadcast the recommended amount while wearing protective gloves, allow for circulation, then retest and adjust as needed. The product is intended for pool use only—store it dry and sealed.

• Test water first; target pH 7.2–7.8 using HTH 6-Way Test Strips is recommended.
• Dissolve or distribute per label instructions; allow circulation before retesting.
• Swimmers can re-enter the pool after treatment when the product is fully dissolved and the label-specified conditions are met.

How often should I check and rebalance pH with this product?

Regular testing is the most reliable way to keep pH stable. Weekly checks, with adjustments as needed, prevent drift and ensure chlorine remains effective. Heavy bather loads, rain, or chemical additions may require more frequent testing.

• Test weekly with HTH 6-Way Test Strips; adjust pH when readings fall outside 7.2–7.8.
• Recheck after rainfall, heavy use, or shock treatments.
• Keep a log of treatments to better predict dosing needs over the season.

Who is this for: HTH 67057 pH Down 5 lb is ideal for homeowners and pool service professionals who need a reliable, easy-to-use chemical for lowering and maintaining pool pH. It suits all common pool surfaces and systems, and is convenient for anyone who tests water regularly and wants clearer water, reduced scale risk, and improved chlorine performance. Keep it on hand as part of a routine maintenance kit alongside test strips and sanitizer for seasonal and emergency adjustments.