Check the listing for details. Natural Chemistry 3 Liter Pool PhosFree. Condition: New. Listed at 49.99 USD. 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. Directions for use: This product is designed for use in properly balanced pool water. Clean or backwash filter. Determine appropriate dose. Shake bottle well prior to application. With circulation pump running, add dose to skimmer. Run filter for 48 hours continuously without backwashing or cleaning. After 48 hours of filtering, clean/backwash filter. Retest phosphate levels, and if necessary, repeat steps 1-5. SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need FedEx or USPS specifically for your order.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. Directions for use: This product is designed for use in properly balanced pool water. Clean or backwash filter. Determine appropriate dose.  Shake bottle well prior to application. With circulation pump running, add dose to skimmer. Run filter for 48 hours continuously without backwashing or cleaning. After 48 hours of filtering, clean/backwash filter. Retest phosphate levels, and if necessary, repeat steps 1-5. SHIPPING: We will do our best to ship your order based on the shipping method selected, however in some cases, your shipping method may need to be modified to meet shipping requirements based on the carrier. Our current carriers used are FedEx and USPS. Please contact us directly through the "Contact Seller" link if you need FedEx or USPS specifically for your order.