Pool Mate 25-Pound Alkalinity Increaser - Stabilizes Pool pH

Our review of the Pool Mate 25-Pounds Premium Alkalinity Increaser finds it best suited to pool owners who need a simple, effective way to raise total alkalinity and stabilize pH. The single biggest reason to buy is its straightforward formulation of 100% sodium bicarbonate that dissolves quickly and reliably changes alkalinity without introducing other chemicals. It is an easy, no-nonsense option for routine pool maintenance that helps prevent equipment corrosion and plaster damage when used as directed.

Key Features

• Pure sodium bicarbonate: Uses 100% sodium bicarbonate to raise total alkalinity without added compounds that might complicate water balance.
• Alkalinity stabilization: Helps keep pool water pH stable by eliminating pH bounce and supporting a consistent water chemistry baseline.
• Clear dosing guidance: Eleven ounces raises alkalinity about 10 ppm per 5,000 gallons, making adjustments predictable for a variety of pool sizes.
• Protects pool surfaces: Regular use reduces the risk of scale formation, metal corrosion and etching of plaster and other finishes.
• Fast dissolving: Formula dissolves quickly when added with the pump running, so it integrates into the pool without long wait times.

Who It's For

This product is aimed at residential pool owners and maintenance professionals who need to maintain total alkalinity in the recommended ranges for different pool surfaces, including fiberglass, marcite, painted, tile or exposed aggregate, and vinyl. It is particularly useful for those who already test water regularly and want a predictable dosing material based on pool volume.

Those who should look elsewhere include users who need multi-step chemicals that adjust pH and alkalinity at once, or pools requiring specialized treatment blends. If you need sealed, resealable packaging because you store chemicals outdoors in wet conditions, consider that some users reported mixed sealability of the bucket lid.

Pros & Cons

Pros

• Reliable single-ingredient formulation that raises total alkalinity without unexpected additives.
• Easy to calculate dose: 11 ounces raises alkalinity 10 ppm per 5,000 gallons, which simplifies maintenance.
• Helps protect equipment and surfaces by reducing corrosion and etching risk when alkalinity is maintained.

Cons

• Packaging sealability received mixed feedback, with some customers noting the bucket lid may not stay firmly closed.

Specifications

Product name	Pool Mate 25-Pounds Premium Alkalinity Increaser
Active ingredient	100% sodium bicarbonate
Net weight	25 pounds
Dosing guideline	11 ounces raises alkalinity 10 ppm per 5,000 gallons
Recommended alkalinity range	Fiberglass 70-100 ppm; Marcite/Tile 80-120 ppm; Vinyl 120-140 ppm
Made in	USA

Our Verdict

The Pool Mate 25-Pound alkalinity increaser is a practical choice for routine pool maintenance because it is pure sodium bicarbonate, easy to dose, and dissolves quickly. It offers good value for those who test water regularly and want a predictable way to keep total alkalinity in range, though buyers who need tight resealing of the container should note the mixed reports on the lid.

Frequently Asked Questions

How much will it raise my pool alkalinity?
Adding about 11 ounces will raise total alkalinity approximately 10 ppm per 5,000 gallons of pool water.

Can I add it directly to the pool?
Yes, add the product directly to pool water while the pump is operating and allow it to dissolve and circulate.

Will it affect pH?
It helps stabilize pH by raising total alkalinity and reducing pH bounce, but you should test both pH and alkalinity and adjust as needed.