Yes, you should clean your filter after adding Phosfree and letting the system run continuously for 48 hours (while keeping an eye on filter pressure to ensure it doesn’t rise about 10 psi over start-up). You should also ensure that the filter is clean prior to starting a Phosfree treatment which will allow the product to work more efficiently.

While these products can assist in the stain removal process, they are also need to be used as maintenance treatments. Metals that cannot be fully removed through the filtration system (especially in sand and cartridge filters) are kept in suspension by Metal Free or Scale Free. Calcium molecules are deformed so they can’t stick together to form scale and other metals are kept in solution so they don’t settle back on a surface to cause recurrent staining.

While these products can assist in the stain removal process, they are also need to be used as maintenance treatments. Metals that cannot be fully removed through the filtration system (especially in sand and cartridge filters) are kept in suspension by Metal Free or Scale Free. Calcium molecules are deformed so they can’t stick together to form scale and other metals are kept in solution so they don’t settle back on a surface to cause recurrent staining.

While these products can assist in the stain removal process, they are also need to be used as maintenance treatments. Metals that cannot be fully removed through the filtration system (especially in sand and cartridge filters) are kept in suspension by Metal Free or Scale Free. Calcium molecules are deformed so they can’t stick together to form scale and other metals are kept in solution so they don’t settle back on a surface to cause recurrent staining.

For liquids, the large overcap is 4oz and the small threaded cap is ½ an ounce

Phosphates come from a wide variety of sources, some of the most common being:

• Fertilizers (if you have a landscaping service, there is a good chance your pool will have issues with phosphates)
• Many stain & scale products that are sold in the swimming pool industry are phosphonic or phosphoric acid based-while these products do a great job at protecting from stain and scale, they also increase phosphate levels significantly. It is ideal to use a stain & scale control like Metal Free or Scale Free that does not contribute to unwanted phosphate contamination
• Dirt/Dust
• Rain
• Soaps (if one chooses to bathe in a pool, which we hope you do not, it will add phosphates to the water)
• Some cleaning products (ex: many tile cleaners will add to phosphate levels)