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Grid Diameter: 10 in / 25 cm
free of frost (cold weather application) surface for proper application
90-Day Algae Prevention & Remover is an excellent broad-spectrum algaecide with a long-term residual effect in the pool
A 32 oz bottle of Reserve covers fresh fill plus weekly maintenance for a typical residential spa through a full fill cycle
Hot Tub Serum Turbo Mineral Purifier | Spa Cartridge Type_Control Grid Diameter: 10 in /The Hot Tub Serum Turbo Mineral Purifier is a slow release mineral cartridge that gives you cleaner, softer spa water the natural way and lets you cut your chlorine or bromine use dramatically. Sized to drop straight into your filter housing, it uses the time tested purifying power of silver and copper to keep bacteria and algae in check for up to four months at a time. The "triple action" name captures what it does: it reduces bacteria naturally,