WinterPill all-in-one formula that is an exclusive 4-part blend making spring openings faster and easier than ever! It has a CLARIFIER to maintain sparkling clear water, a SCALE INHIBITOR to prevent scale build- up, and a STAIN INHIBITOR to prevent iron, copper and manganese stains. WinterPill is ENZYME- ENHANCED – it naturally destroys all organics, preventing water ring, enhances filter performance and improves sanitizer efficiency. AP71 For Pools up to 30,000 Gallons