It is a PP cotton filter, which can effectively filter large particles such as rusts, sand, and heavy metals in the water, remove impurities in the shower water and monitor water We recommend replacing it every 1~2 months Of course, you can change time to replace filter according to the water of your city and the degree of pollution of filter Suitable for most detachable handheld showers, just twist the lower part of the body and put filter cotton Great for households, especially those with sensitive skin or hair, find to minimize chemically exposure during daily showers Easy to replace: none tool required to replace Simply open the casing of the shower cartridge filter, remove the old and replace it with a new, Manufacturer: Oxxggkao