The water coming directly from the faucet may be clean in our eyes, as a matter of fact, it is potentially ambushed with many substance that may do harm to human bodies. Lan-Shan's water filter get rid of all the impieties in the water. To maintain the best performance, the cartridge inside the water filter should be changed in a certain period of time. The mounting bracket is made of coated steel plate which is strong and long-lasting. Please see the detailed product specifications to find cartridges that fit your water filter.