EBayCome with 1x composite filter + 4x pp cotton filter Composite filter (internal filter) : Strongly remove 99% chlorine, filters thms, impurities and other harmful Substance. PP cotton filter (pre-filter) : Filter and remove sands, rust and sediment. Super double filters design - Small water pressure or the filter clogging is usually caused by macromolecular impurities (such as sediment, rust, etc.). Replacing the whole unit is so costly, but the inferior shower filters do not work at all. Super double-filters solution change this dilemma. No need to frequently replace the internal filter(Composite filter), just replace the PP cotton filter individually according to the actual situation. 100% Quality satisfa ction guaran tee - Our goal is 100% customer satis faction, so if you are not satisfied with the product, please contact us anytime online on Amazon, we are pleased to serve you. If you would like to return the product, we will pay your mon ey back. Product description Powerful Protection for The Whole Family shower filter L720-Plus is our new launched water purification product. In this model we've improved and rebuilt the filter constructure, revolutionary developed double-filters shower filter, no need to replace the whole unit anymore when geting clogged, but only change the pre filter (PP Cotton filter) individually. Meanwhile, it still has the former filter properties such as removal of 99% chlorine, filter THMs, sediments, irritants, and foul odors. We focused on what is so important to you - your health. PACKAGE INCLUDES 1X COMPOSITE FILTER 4X PP COTTON FILTER COMPOSITE FILTER (INTERNAL FILTER) Strongly remove 99% chlorine, filters thms, contaminants, impurities and other harmful Substance. It can last about 180 days, but the blockage is easily caused if the water quality is poor. Please replace this filter when the filter gets clogged or the water flow becomes smaller. 5MM THICK PP COTTON The filtration area is much larger than the normal ones, this filter can remove sand, rust, and most of the impurities bigger than 10 microns. It can last about 180 days, but the blockage is easily caused if the water quality is poor. Please replace this filter when the filter gets clogged or the water flow becomes smaller. HOW TO DO WHEN GETING CLOGGED? If the local water contains many impurities, the impurities accumulated on the surface of the filter, which made it clogging sharply (Less than its regular lifetime), please follow the steps as below to replace the PP cotton filter. Step1: When the water flow becomes smaller, please replace the PP cotton filter firstly. Step2: Remove the existing PP cotton filter, and no need to change the composite filter (It can last about 6 months, please replace it according to the manual's instruction). Step3: Replace the new PP cotton filter as the picture showed. Step4: The water flow is resumed normal.