Reduces Phosphates: Natural Chemistry's Phosfree enables pool owners to drop phosphate levels in your pool to almost nothing. Clear Water: PHOSfree works in the filter to minimize any water clouding, ensuring the water stays sparkling clear. No Phosphates, No Problem: 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 less clouding of the water. Effortless Maintenance: Simplify pool care with Phosfree designed to reduce overall maintenance while keeping your water clean and clear. 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. Reducing phosphate levels in pools is easy with Natural Chemistry's patented Phosfree technology. Phosfree is formulated from lanthanum (rare earth) compounds. When added to the skimmer, a thin coating of Phosfree forms on the filter media. As pool water flows through the filter, phosphates are reduced to a very low level.