The concept of water filtration is defined in terms of the host and guest location of the water. When water is used as the main body, water filtration is a medium to filter and treat other impurities. It is a filtration method to effectively separate solid and gas through water dissolution. When water is treated as an object, water filtration is a special treatment method for water. It is a method to get clean water by suspending solids in water through filtration medium.