Dry calcium hypochlorite chlorination for commercial pools

Dry cal hypo feeding in plain language

Calcium hypochlorite is a solid that releases available chlorine when dissolved. A Pulsar feeder holds briquettes in a hopper above a spray chamber. When the controller signals demand, water sprays the briquettes and the resulting chlorine solution flows into the pool's recirculation line. Between demands the briquettes stay dry, so the chemical is stored as a stable solid rather than as bulk bleach that loses strength in storage.

Suitable facility types

The full-size Precision is positioned by Pulsar for very large pools: competition venues, municipal aquatic centers, and waterparks. The Precision 30 brings the same approach to mid-size institutional pools. Small warm therapy pools and spas rarely need either; control and visibility matter more there.

Facility size and demand

Pulsar publishes gallonage guidance, and its own pages disagree with each other for the Precision 30. FreyTech sizes by measured chlorine demand: daily chlorine use from records, peak bather load, temperature, indoor or outdoor exposure, and turnover. Because New York prohibits stabilizer, only the non-stabilized outdoor guidance applies in our territory.

Storage, handling, ventilation, and the mechanical room

Calcium hypochlorite is an oxidizer. It needs dry, cool, ventilated storage segregated from acids and organics, original closed containers, SDS on site, and a loading routine with PPE. Local fire code and the health department review storage quantities and location. The feeder itself needs a water loop (booster pump for Precision; flow-based Venturi for Precision 30), drainage, clearances, and power. Cal hypo adds calcium hardness over time, so pH control and water replacement are part of the design.

Converting from liquid or gas chlorine

Conversions remove bulk bleach storage or gas cylinders and their handling burden. Expect to re-plan chemical storage, adjust pH control, confirm the controller's demand output and interlocks, and involve the engineer for plan review where treatment equipment is modified (10 NYCRR 6-1.8). Gas conversions also remove the qualified-operator requirement that gas chlorine triggers.