Calcium hardness is one of the most overlooked parts of water balance, until it causes problems. Get it wrong and you risk corrosion, etched concrete and damaged grout. The trouble is that traditional calcium flakes are a hassle to work with: they generate dangerous heat as they dissolve, clump into sludge if they absorb moisture, and eat up your time.

PoolFlow Protect is the industry’s only liquid calcium hardness increaser, and it does away with all of that. Just measure and pour. No dangerous heat, no melted buckets, no waiting for solids to dissolve, just accurate, consistent calcium hardness every time.

Active ingredient: 100% Calcium Chloride

Suitable for: All pools and spas, including concrete, fibreglass and vinyl-lined.

Why Pool Owners and Professionals Choose PoolFlow Protect

Safer to Handle. No dangerous heat generation from dissolving solids, so no melted buckets and no cooling delays. A liquid that’s simply poured in removes the hazard that comes with traditional calcium flakes.

Protects Your Equipment. Maintains the right calcium hardness to guard against corrosion, concrete etching and grout damage, helping your pool and its equipment last longer.

Instant Application. No weighing, no dissolving, no waiting. Just measure and pour for immediate, even results.

Accurate Every Time. Consistent liquid dosing means precise treatment without the overdosing risk that comes with solid products.

Automation Compatible. Ideal for automatic dosing systems in both commercial and residential installations.

Australian Made. Engineered and manufactured here in Australia, to the same pharmaceutical-grade standards as the full PoolFlow range.

Application Rate: Add 1L of PoolFlow Protect to increase calcium hardness by 10ppm in a 50,000 litre pool

Target Range: Maintain calcium hardness between 200-400 ppm for pools and 150-250 ppm for spas to ensure optimal water balance and equipment protection.