Built-in active-carbon filter layer,with good filtering effect,makes the air in the refrigerator freshs. The pores are developed and have strong adsorption capacity.It can effectively remove residual chlorine and in water. The water quality is deeply purified by,using PP-cotton,pre-compressed activated-carbon,RO-membrane,and post ultrafiltration activated-carbon 4 filter layer.The water can be directly drunk. Water purification effect: effectively remove scale,sediment,organic matter,dirt,chemical-residues. Be sure to check your use and maintenance guide before installing,slide the new filter into the housing and push it until it locks in place.It is recommended to replace the water filter every 6 months to the highest water quality.