SpaPure Liquid Hardness Increaser is a pre-dissolved liquid calcium formula that safely raises the calcium hardness of your spa water. Because it's already in liquid form, it mixes in instantly — no granules to dissolve, no powder settling on the bottom of the shell. Calcium hardness is one of the most overlooked parts of water balance, but it matters as much as pH. Water that's too soft — low in calcium — is corrosive: it pulls minerals from wherever it can find them, attacking your heater, pump seals, jets, and the spa shell, and it's a leading cause of stubborn foaming. (Water that's too hard causes the opposite problem — scale — so the goal is the right balance, not maximum calcium.) If your fill water is soft, or it runs through a water softener, your spa almost certainly needs this. Bringing calcium hardness into range protects your equipment, extends the life of the spa, reduces foaming, and gives the water a more pleasant feel — and the liquid format makes it about as easy to add as it gets. Pro Tip: If you fill your spa from a water softener, you need this product. Softened water has had its calcium stripped out, which makes it aggressively corrosive in a hot tub — exactly the wrong water for an expensive heater. Test your fill water's hardness and bring it up to range before that soft water has a chance to start eating at your equipment. Brand SpaPure®
