In The Swim Ultimate Pool Closing Kit - Winterizing Chemicals for Above Ground and In-Ground Pools - Up to 35,000 Gallons;

Keeps your pool algae free all winter long! This pool chemical kit is formulated for pools up to 35,000 gallons and contains NO chlorine, so it is safe to use with vinyl pool liners. Special non-chlorine time-release floater dispenses an oxidizer which eliminates carbon dioxide from the pool water, essentially starving algae so it cannot survive. This chemical kit also includes Natural Chemistry Pool Magic Spring & Fall with Phos Free which also prevents algae. Complete kit includes: 1 quart Natural Chemistry Metal Free, 3 lbs. Chlorine-Free Shock, 1 Time-Release Floater filled with 4 lbs. of non-chlorine oxidizer, 1 quart Natural Chemistry Pool Magic Spring & Fall with Phos Free, and 1 Winter Sorb (oil absorbing sponge). Complete winterizing instructions included. Not for use in pools using a biguanide based sanitizing system.