First Choice Cal-Shock - Calcium Hypochlorite, 5 lb Pail

Excellent formulation for super-chlorination shock treatments. Quick dissolving, 68% Calcium Hypochlorite kills algae, bacteria and destroys organic contaminants.

Note: For every 10 ppm Free Chlorine (FC) added by this Cal-Hypo product, it also increases Calcium Hardness (CH) by 8 ppm.

We support local suppliers and having a minimal carbon footprint so the brand you receive may vary.

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We have ramped up production and our C5 Cassettes are back in stock

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