PHOSfree® most effective way to remove phosphates. 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.
