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Increase Calcium for hot tubs boosts the natural hardness of spa water. This prevents excessive etching and corrosion of hot tub equipment caused by water which contains very low levels of dissolved calcium. Also reduces foaming caused by soft water.

Fast-dissolving form for spas
Increases low calcium level
Prevents corrosion & foaming
Product notes: Contains granular calcium chloride, 100%. 1 oz. of this product added to 500 gallons will increase calcium hardness about 10 ppm. Test with Hardness Test Strips.

Our premium quality 1-1/4″ Bromine Tablets provide excellent sanitizing for spas and hot tubs, without nearly the odor of chlorine. These maximum potency bromine tablets are slow-dissolving for optimal use in warmer water, so they are more economical to use. Very effective against algae and bacteria. You cannot buy better quality bromine tablets at any price.
Highest potency for superior effectiveness
Compare 98% active ingredient to any other brand
Stock up and save even more with our quantity discounts
1.5 lb. bottle Brominating Tabs
Product notes: Bromochloro-5, 5-dimethylhydantoin 98%. Guaranteed fresh. Use in our adjustable release rate Floating Feeder (below).