Pool Mate calcium hardness increaser 8lb container for balanced pool water
Pool Mate calcium chloride powder poured into a bucket to mix
Pool Mate hardness increase being mixed in a bucket with water
Pool Mate solution poured around pool perimeter with circulating water
Pool Mate test kit checks calcium hardness to guide adjustments

Pool Mate

Pool Mate 8-Pounds Premium Calcium Hardness Increaser for Pools | 100% Calcium Chloride

High-performance patio lawn and garden made for confident daily results

$27.02

3 shoppers currently have this item in cart.

Low stock: only 5 left in inventory. Add to cart before it's gone.

Shop Pay installment options may appear at checkout where eligible.

Free shipping Secure checkout 100% refund eligible
Bundle & save Buy 2 and save checkout time

Premium patio lawn and garden quality selected for United States (USA) customers.

Routine pack Build your routine pack (3)

Fast dispatch with always-free shipping and secure checkout on every order.

Free shipping

i

Free shipping on every order. Fast dispatch, tracked delivery, and secure checkout included.

Easy returns

i

Simple return flow and responsive support for eligible items.

Peak-demand shipping delays

i

During high demand, deliveries may experience short carrier delays. Tracking updates remain active for every order.

24/7 customer support

Questions before checkout? Our team is available and ready to help.

Return & RefundEasy returns and policy details Shipping PolicyDelivery process and tracking info
Share

Why customers choose Cera Garden

Balance and protection for pool water

Pool Mate 8-Pounds Premium Calcium Hardness Increaser is a dry, granular calcium chloride designed to raise total hardness in pool water when tests show a low calcium level. Used with a reliable test kit, it supports the maintenance of your pool within the recommended range for your surface type.

Why calcium hardness matters

Calcium hardness helps stabilize water chemistry and may influence surface integrity. Keeping hardness within the suggested ranges can support consistent water balance and may reduce the risk of corrosion or etching when surfaces are in contact with treated water.

  • Rapidly increases total hardness when added according to the chart
  • Ideal hardness range is typically 200-400 ppm, depending on surface type
  • 8 ounces raise hardness by about 10 ppm in a 5,000-gallon portion of water

How to use

Before application, test your pool water with a dependable test kit to identify the current calcium level. In a plastic bucket filled with pool water, mix up to 2 pounds of the product per about 5 gallons of water. Then slowly pour the solution around the pool perimeter while the circulating system runs. For a 10,000 gallon pool, avoid adding more than 10 pounds in a single 2-hour period.

Practical dosing by pool type

  • Vinyl Pools: target 200-300 ppm
  • Tile and Exposed Aggregate Pools: target 200-400 ppm
  • Marcite, Fiberglass, or Painted Pools: target 250-400 ppm

What to expect from this product

  • Increases calcium hardness to help maintain water balance
  • Dry, granular formula is easy to distribute with a running filter
  • Helps minimize staining or surface changes related to low hardness

Note: Results depend on current water chemistry and pool size. Always follow the chart included with the product for dosing guidance, and adjust based on regular test results.

FAQ

Q: What is Pool Mate 8-Pounds Premium Calcium Hardness Increaser used for?

A: Pool Mate raises calcium hardness in pool water to help reach the recommended range for different surfaces.

Q: How do I apply this product?

A: Test water, mix up to 2 lb per ~5 gal in a bucket, then slowly pour around the pool edge with the pump running. For 10,000 gal pools, cap at 10 lb per 2 hours.

You may also like