Polyphosphate salt for water filters, in a package of 500 g made of plastic material. The salt serves as a spare part for water filters used in washing machines' water supply system and it is used to clean the water and neutralize lime and scale residues, while extending the life of the washing machine. The content of the package is suitable for 4 refills of filter devices. It is recommended not to use the salt for filtering drinking water. This product is suitable for use with the washing machine water filter (code 46230).