Here are a few common types of filters: 1. Air oxidation filter 2. Catalyst filter 3. Water softener 4. Reverse osmosis system 5. Multi-media filter

The main function of a water softener is to convert hard water into soft water. Hard water contains high concentrations of calcium and magnesium ions, which are easy to form scale in pipes, boilers and household appliances, affecting the efficiency and life of the equipment.