BioGuard® Pool Closing Complete – 3‑in‑1 Winterizing Formula (2 L) – part #25771BIO

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Concentrated 3‑in‑1 formula that clarifies water, prevents scale and corrosion, and protects pool surfaces and equipment during winter months. Safe for all pool types: in‑ground, a bove‑ground, chlorine, bromine, saltwater, and SoftSwim® systems. Treats up to 25,000 gal per 2 L bottle; half dose for pools ≤12,000 gal to save product. Easily administered by slowly pouring around the deep end while the pump runs, followed by two hours of circulation. Compatible with BioGuard Arctic Blue winter kits—but powerful enough to be used on its own. Ideal as a final closing-step to simplify spring start-up and reduce maintenance. Show more