My 9 year old son, who is an avid swimmer has been using HYYGIA for the past two years and he couldn't be happier with the results. Before using the HYYGIA filter, my son's skin would become itchy after swimming. But since switching to this filter, his skin has been completely free of irritation. So, if you are looking for a reliable and effective shower filter. Give HYYGIA try to see the difference for yourself.