GLB Oxy-Brite 2.2 lb For more than 30 years, oxy-brite has offered a non-chlorine alternative for shock oxidizing pool water In addition to its effective shock oxidation treatment, oxy-brite includes unique blue water brightening crystals that polish the water Swim immediately after treatment; this item is not for sale in Catalina island Restores sparkle to cloudy water; reduces sanitizer demand Measures 9.6-inches in length by 3.3-inches in width by 3-inches in height