KRPLUS Pre Filter is made of MLT Carbon Cloth Material, RO Pre-filter is used in the first stage of purification and it filters the raw tap water before being purified by your RO water purifier. In addition to filtering out the physical impurities, it also increases the life of the filters (like Sediment Filters, Pre-Activated Carbon Filter and RO Membrane) in your water purifier. The main function of pre filter is to remove large and fine particles from a drinking water, such as sand, dirt, silt, and rust particles. Each cartridge is individually shrink-wrapped. These pre filters are suitable for a standard Reverse Osmosis Water Filtration Unit or any type of Water Filtration Unit with 10 housing. It is important & recommended to change your Ro filter after 2-3 months while to get rid of all the dust and chlorine taste in the water which gets clogged over a period of time. This is a high quality and widely used reverse osmosis Filter, used worldwide in reverse osmosis systems for domestic water Purifier, aquarium and all other RO’s due to its strength of filtering, durability and reliability. This is a high quality and widely used Reverse Osmosis Filter, The actual frequency depends on the quality of incoming water and your usage. But ideally, you should replace the RO pre-filter cartridge every 3 months. You can also clean the pre-filter cartridge with clean water after some time. Benefits of Installing Pre-Filter for RO Water Purifier :-1. It filters out all physical impurities like dust, mud, sand, rust and silt from raw water.2. It prevents pre-mature choking of the main filters like Sediment Filter, Carbon Filter and RO Membrane.3. Saves money by increasing the life of RO filters and Membrane.When to Replace RO Pre Filter? The actual frequency depends on the quality of incoming water and your usage. But ideally, you should replace the RO pre-filter cartridge in every 3 months. You can also clean the pre-filter cartridge with clean water after some time.