(2) 1 lb. bottles. Use Power Soak when you need a fast-acting, heavy-duty granular cleaner for hot tub spa & pool filter cartridges. The formula recommended by major manufacturers and preferred by professionals, releases its power when mixed with hot or cold water. Removes lotion residues, body oils, dirt & grime. Improved double-strength formula now also contains enzymes for added cleaning power to devour organic contaminants. Product notes: Non-foaming. Economical to use. Double concentrated - use just 1/2 cup per cleaning.