Pool Mate 16-Pounds Calcium Hardness Increaser - Raises Pool Hardness

In this review the Pool Mate 16-Pounds Calcium Hardness Increaser is evaluated for pool owners who need a straightforward way to raise and maintain proper calcium hardness. The bottom line: it is a no-frills, granular calcium chloride product that reliably increases total hardness and helps prevent corrosion or etching when used as directed. For anyone managing plaster, tile, fiberglass or vinyl pools who finds their hardness readings below recommended ranges, this product delivers the primary benefit - bringing calcium hardness into the safe 200-400 ppm band without a complicated procedure.

Key Features

• 100% calcium chloride: A pure formulation that targets total hardness quickly, avoiding fillers that slow results.
• Rapidly increases hardness: Each 8 ounces raises calcium hardness about 10 ppm per 5,000 gallons, allowing controlled adjustments.
• Prevents surface damage: Raising hardness in low-calcium water reduces the risk of corrosion, staining and etching on pool surfaces.
• Clear dosing guidance: Includes a dosing chart and recommends dissolving in a plastic bucket for even distribution while the circulation system runs.
• Suitable for multiple pool finishes: Target ranges provided for vinyl, tile, exposed aggregate, marcite, fiberglass and painted pools make it broadly applicable.

Who It's For

The Pool Mate calcium hardness increaser is best for homeowners and pool service techs who test water regularly and need a concentrated product to correct low hardness levels. It works well for pools from small residential volumes up to 10,000 gallons where measured additions are required to reach the recommended hardness bands.

It is less suited to users who are uncomfortable handling granular chemicals or who expect blended, multi-function products that also adjust alkalinity or pH. Those needing a combined balancer should consider a dedicated multi-parameter treatment instead.

Pros & Cons

Pros

• Effective: customers report it raises calcium levels as expected and performs like higher-priced brands.
• Fast dissolving: the dry granules dissolve quickly when pre-mixed in a bucket, making application simple.
• Value: the concentrated 16-pound package provides good coverage for multiple adjustments.

Cons

• Some users report concerns about incidental chlorine content that may stain surfaces if not applied carefully.

Specifications

Product type	Calcium hardness increaser (granular)
Net weight	16 pounds
Active ingredient	Calcium chloride, 100%
Effect per measure	8 oz raises hardness 10 ppm per 5,000 gallons
Recommended hardness	Vinyl 200-300 ppm; Tile/aggregate 200-400 ppm; Fiberglass/paint 250-400 ppm
Application method	Dissolve in pool water bucket and pour around perimeter with pump running

Our Verdict

Pool Mate 16-Pounds Calcium Hardness Increaser is a practical, economical choice for keeping pool water within recommended calcium hardness ranges. It is especially useful for owners who already test water and want a focused treatment to prevent etching or corrosion. Given its fast dissolution and clear dosing, it offers strong value, but users should follow the application steps closely to avoid any surface staining risk reported by some customers.

Frequently Asked Questions

How much does 8 ounces change hardness?
8 ounces raises calcium hardness approximately 10 ppm per 5,000 gallons of pool water.

How should I add the product to my pool?
Dissolve the granules in a plastic bucket of pool water (up to 2 lb per 5-gallon bucket), then slowly pour the solution around the pool perimeter while the circulation system is running.

What hardness range should I aim for?
Target ranges vary by finish: vinyl 200-300 ppm, tile and exposed aggregate 200-400 ppm, and marcite, fiberglass or painted pools 250-400 ppm.