Why do I need to add Metal Free on a weekly basis or Scale Free Monthly?

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.

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