Protect your spa or above ground pool from corrosion and surface damage with Calcium Hardness Increaser 650g (Product #27200C69). This fast-dissolving formula safely raises calcium hardness levels in spa and pool water, helping prevent foaming, etching, and equipment corrosion.

Balanced calcium hardness is essential for protecting heaters, pumps, liners, and surfaces. If your water is too soft, it can become aggressive and start pulling minerals from metal components and pool finishes. This completely soluble formula makes adjustments simple — and you can swim immediately after application.

✔ Ideal For:

• Hot tubs & spas

• Small above ground pools

• Vinyl, fiberglass, and acrylic surfaces

How Much Do You Need for Above Ground Pools?

General Guideline:
Approximately 25 grams (1 capful) per 1,000 litres will raise calcium hardness incrementally. Always test water first and adjust gradually.

Below is an estimated bottle usage guide (based on increasing calcium hardness by approximately 50 ppm — exact amounts may vary depending on starting levels):

8–10 ft Round Pool (5,000–8,000 L)

• Approx. 125–200 g required

• 1 bottle treats 3–5 adjustments

12 ft Round Pool (10,000–12,000 L)

• Approx. 250–300 g required

• 1 bottle provides 2 full treatments

15 ft Round Pool (15,000–18,000 L)

• Approx. 375–450 g required

• 1 bottle provides 1–2 treatments

18 ft+ Above Ground Pools (20,000+ L)

• 500 g+ required

• May require 1–2 bottles per full adjustment

For larger above ground pools, purchasing multiple bottles may be necessary depending on how low your calcium levels are.

Key Benefits

✔ Raises calcium hardness quickly
✔ Completely soluble formula
✔ Safe to swim immediately after application
✔ Protects heaters, pumps, and pool surfaces
✔ Reduces corrosion and equipment wear

Directions for Use

1. Test water to determine current calcium hardness level.

2. Follow the chart on the back of the bottle.

3. Broadcast 25 grams (1 capful) per 1,000 litres as required over spa or pool water.

4. Allow water to circulate fully before retesting.

Maintaining proper calcium hardness extends the life of your spa or above ground pool equipment and ensures balanced, comfortable water all season long.