Phosphate Removal: Phosphates enter the water from sources like leaves, decaying plant matter, acid rain, waste, and sweat. PHOSfree Extra-Strength by Natural Chemistry is specifically designed to quickly reduce high phosphate levels. 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 low levels. Pool Maintenance Made Easy: This product effortlessly ensures that even in the largest water volumes, phosphate levels remain consistently low. Pioneer in Phosphate Removal: Natural Chemistry pioneered the use of phosphate removal technology. Phosfree Extra Strength​ is specifically designed for high level phosphate removal. Tested and Proven Effective: Natural Chemistry products are known for delivering reliable results and making water care less complex. Natural Chemistry carries an extensive line of pool and spa solutions that match your unique needs. Natural Chemistry Commercial PhosFree. Commercial sizing for larger pools.