Polyphosphate crystals dissolve in water and coat elements such as iron, calcium, magnesium, etc., making it impossible for these elements to "precipitate" out of the water and create the problems associated with "hard" water, such as the formation of salts in pumps, washing machine resistors, etc. 

They protect appliances and increase the effectiveness of detergents by 30%. The package contains 250g of material, which is sufficient for 3 refills of the Aqua Filter washing machine filter.