Vitamin C 15-stage filtration: quickly, easily and naturally eliminates all blockages in city water, hard water and well water systems. Formulated to maintain the bodys natural pH level for both hot and cold water. Our universal shower filters can be placed on wall mounted, hand held, rainfall and combination shower heads for home use. Universal replacement cartridge standard size 2.7 x 2.4 inches, replacement time depends on water quality and frequency of use. Easy to remove, simply open the shower cassette filter housing, remove the old one and replace with a new one, and make sure the washer is in the slot inside the filter to avoid leaks. Our high performance in-line water filters do not reduce the existing water pressure, thus improving the flushing effect. However, if you have a lot of sediment, frequent backflushing may be required to avoid a reduction in water flow. Easy to install, no tools or plumbers required. Simply rinse the shower filter, remove the old shower head, wrap the new Teflon tape, lay the rubber gasket flat and screw on the shower filter and shower head, to remove any carbon dust build up, allow water to run through the filter for 5-10 minutes before use. Enjoy clean water