4kg Calcium Hardness Increaser – For Spa Pools & Swimming Pools

Protect your spa or pool from corrosion and surface damage with our 4kg Calcium Hardness Increaser, ideal for home spas, plunge pools, and smaller swimming pools. Adding calcium chloride helps maintain the correct hardness level in your water, reducing foaming, hing, and wear on spa heaters, shells, and plumbing. 💧 Why Use a Calcium Increaser?

Reduces corrosion of spa and pool equipment

Minimises foaming and hing

Helps extend the life of your pool shell, heater and pump

Essential for balanced, clean, and clear water 📏 Dosage Guide:

For Spas (Per 1,000L):
Add 15g to raise calcium hardness by 10 ppm
(e.g. 150g = 100 ppm in 1,000L)

For Pools (Per 20,000L):
Add 300g to raise calcium hardness by 10 ppm
(e.g. 1.5kg = 50 ppm in 20,000L)

🧪 Ideal Range:

Spas: 150–250 ppm

Pools: 200–400 ppm (varies by pool surface) 📦 :

Size: 4kg bucket

Active Ingredient: Calcium Chloride

Suitable for all spa types, plunge pools & residential pools 🛍️ Order Now with Fast NZ-Wide Shipping

Pickup available from Perfect Pools at 15C Douglas Alexander Parade, Albany

Open Mon–Fri 9am–4pm, Sat 10am–2pm

Onsite valet and water balancing services available in Auckland