HTH 42036 Floater With Chlorine Tablets, 3 LbsHTH makes pool care easier than ever with the pre filled chlorinating floater that helps sanitize and protect your pool water for up to 4 weeks. This is a single use floater; once chlorine treatment has entirely dispersed, the floater will tip sideways. Highlights: Size: 3 Lbs Treats up to 20,000 gallons for up to 4 weeks Kills bacteria and algae Tips when empty Single use floater Use and dispose Pre filled floater includes HTH chlorine treatment for