3, To increase the free chlorine level by 2.5ppm add 5 grams of granules (a teaspoon). 5KG Stabilised Chlorine Granules. 5, Use a plastic spoon. About Hot Tub Suppliers. Hot Tub Supplier are distributors of luxury ZSPAS and ZEN SPAS hot tubs designed with the latest Balboa Water Group systems.
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