https://spapureusa.com/our-resources/alk-increaser/
ALK INCREASER - SpaPure
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https://thehottubstoreduluth.com/product/spapure-granular-hardness-increaser-pint/
SpaPure - Granular Hardness Increaser - Pint - The Hot Tub Store Duluth
Apr 23, 2025 - Water needs calcium hardness. If your levels are too low, a small addition of Hardness Increaser brings the levels up safely while not clouding the water. When...
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