Low pH is one of the most common and most damaging pool water problems. When pH drops too far, water becomes aggressive—corroding metal components, etching plaster, irritating skin and eyes, and reducing the effectiveness of chlorine. GLB pH Up 5 lb is a professional-grade pH increaser designed to safely and predictably raise low pH levels, restoring balance and protecting your pool system.

pH control isn’t just about comfort. It directly impacts sanitizer performance, surface longevity, and equipment life. GLB pH Up provides a clean, fast-acting solution that helps pool owners and service professionals correct low pH without clouding water or causing chemical spikes.

The 5 lb size is ideal for residential pools, spas, and routine maintenance, offering precise control without excess product.

Why Proper pH Balance Matters in Pool Water

pH measures how acidic or basic your pool water is. When pH falls below the recommended range (typically 7.2–7.6), water becomes corrosive and unstable.

Low pH can cause:

• Eye and skin irritation

• Etching and roughening of plaster surfaces

• Corrosion of heaters, pumps, ladders, and fittings

• Staining from dissolved metals

• Reduced chlorine efficiency and higher sanitizer demand

Correcting pH restores swimmer comfort and prevents long-term damage to expensive pool components.

How GLB pH Up Works

GLB pH Up uses a high-quality alkaline compound that dissolves easily and raises pH in a controlled, predictable way. When added according to label directions, it increases pH without causing sudden swings or cloudy water.

Once pH is properly balanced:

• Chlorine sanitizes more efficiently

• Water feels softer and more comfortable

• Equipment is protected from corrosion

• Other chemical adjustments become easier and more stable

This consistency is why GLB products are widely used by professional pool technicians.

When to Use GLB pH Up 5 lb

GLB pH Up should be used whenever test results show pH below the recommended range.

Common Situations That Lower pH

• Heavy rain or fresh water dilution

• Frequent acid use

• High bather loads

• New plaster curing

• Saltwater chlorine generator operation

Addressing low pH promptly helps prevent compounding problems that require more chemicals later.

Why pH Must Be Correct Before Sanitizing

Chlorine effectiveness depends heavily on pH. When pH is too low or too high, chlorine cannot sanitize efficiently—even if test readings appear normal.

By restoring pH balance, GLB pH Up helps:

• Maximize free chlorine effectiveness

• Reduce chlorine consumption

• Maintain clearer, healthier water

• Improve overall chemical efficiency

Balanced pH means fewer adjustments and more predictable water care.

Safe for All Pool Types and Systems

GLB pH Up 5 lb is compatible with:

• Chlorine pools

• Saltwater pools

• Vinyl, plaster, fiberglass, and tile surfaces

• Cartridge, sand, and DE filtration systems

When used as directed, it will not damage pool finishes or equipment and integrates seamlessly into routine maintenance programs.

Works Best as Part of a Complete Balancing System

pH does not exist in isolation. For best results, pH should be adjusted after total alkalinity is within range. Proper alkalinity stabilizes pH and prevents rapid swings.

GLB pH Up pairs naturally with:

• GLB Alkalinity Up

• GLB chlorine sanitizers

• Water testing kits

• Scale and stain prevention products

This sequencing reduces chemical waste and improves long-term water stability.

Product Information

Buy with Confidence from Benchmark Pool Supply

When you purchase GLB pH Up 5 lb from Benchmark Pool Supply, you’re getting a trusted, professional-grade water balancer selected for reliability and predictable performance. This is the same product pool professionals rely on to protect equipment, improve swimmer comfort, and keep sanitizer working at peak efficiency.

Proper pH control reduces long-term maintenance costs, extends the life of pool surfaces and equipment, and simplifies every other aspect of water care. We stock GLB pH Up because it delivers consistent results without unnecessary additives or guesswork.