Natural Chemistry Pool Magic Spring & Fall Purifier – 1 Liter (ltr)/33.9 Ounce (oz)

Pool Magic Spring & Fall – For Hassle Free Spring Startup:Special concentrated cold-water formula for use in the fall to close pools and/or in the spring when opening to ensure hassle-free start up. Powerful formula prevents winter waterline ring, preserves pool liners and finishes, and reduces staining and the need for acid washing1L/33.9oz treats 25,000 gallons