“Swimming Pool Winterizing Ball For Pool – Winter Pill- Apt for Inground and Aboveground Pools “

Amazon.com Price: $22.98 (as of 26/01/2020 23:11 PST- Details)

The WinterPill is safe for use in cartridge, sand, and DE filtration systems. It is compatible with all pool surface types and can be used in in-ground and above ground pools
Perfect for winter and mesh safety covers
Use the winter ball with salt chlorine generators, chlorine, and mineral sanitizers

Usually ships in 2-3 business days