2) NEW Natural Chemistry 05122 Spa Swimming Pool Perfect Plus PHOSfree - 1L Each 2 New Natural Chemistry Pool Perfect + PHOSfree 1 Liter Each Maintains phosphate level near zero Cleans waterline and filter while reducing surface oils and other non living organics SMARTZyme Technology reduces the buildup of non living organic contamination All the benefits of Pool Perfect and PHOSfree combined