Place Aquafix flow bags in a place where the flow of water is high (e.g. near a filter). Use a suitable number of flow bags to obtain the desired level of hardness lowering. In this form of a cation exchanger, the process runs slowly and a maximum use of Aquafix exchange capacity takes place after 5 – 7 days. The capacity of one flow bag to soften water is 200 l ×°d (one Aquafix bag reduces hardness by 2 °d in 100 l of water). Flow bags are intended for multiple use and the cation exchangers they contain can be regenerated many times in a solution of table salt according to the guidelines given in the directions for use.