Check the listing for details. Natural Chemistry PHOSfree Phosphate Remover. Color: Marine Blue, Condition: New. Listed at 34.99 USD. Natural Chemistry PHOSfree is formulated from lanthanum (rare earth) compounds. When added to your skimmer, a thin coating of PHOSfree forms on the filter media. As pool water flows through the filter, phosphates are reduced to very low levels due to the lathanum and phosphate molecules sticking together. Works inside the filter which means no clouding of the water.For DE & Cartridge Filters: Do not add more than 1.5L (48oz) at a time. If more than 1.5L (48oz) is needed to treat, be sure to clean or backwash the filter between treatments. Please Note:Algae must be treated prior to testing and lowering phosphates. Chlorine must be under 5ppm before testing phosphates.Dose per 10,000 gallons:Phosphate level: 300ppb or Less PhosFree dosage: 16ozPhosphate level: 600ppb PhosFree dosage: Powered by Frooition Frooition | No-js Template | eBay design, eBay store design, eBay shop design, eBay template design, eBay listing design (ver:froo_no_js) This listing is currently undergoing maintenance, we apologise for any inconvenience caused.Natural Chemistry PHOSfree is formulated from lanthanum (rare earth) compounds. When added to your skimmer, a thin coating of PHOSfree forms on the filter media. As pool water flows through the filter, phosphates are reduced to very low levels due to the lathanum and phosphate molecules sticking together. Works inside the filter which means no clouding of the water.For DE & Cartridge Filters: Do not add more than 1.5L (48oz) at a time. If more than 1.5L (48oz) is needed to treat, be sure to clean or backwash the filter between treatments. Please Note:Algae must be treated prior to testing and lowering phosphates. Chlorine must be under 5ppm before testing phosphates.Dose per 10,000 gallons:Phosphate level: 300ppb or Less PhosFree dosage: 16ozPhosphate level: 600ppb PhosFree dosage: Powered by Frooition Frooition | No-js Template | eBay design, eBay store design, eBay shop design, eBay template design, eBay listing design (ver:froo_no_js) This listing is currently undergoing maintenance, we apologise for any inconvenience caused.