Prefilter: it can filter large particles of debris and secondary pollution of municipal water supply, including rust, sediment, algae, etc. It mainly plays a protective role in water heaters, pipelines, etc. the filtered water can be used for domestic water, but it can not be drunk directly. It needs to be connected with a water softener before drinking.

Water softener: sodium ion is used to replace calcium and magnesium ions in water, so as to soften water quality and prevent scaling, protect subsequent water purification equipment and water related electrical appliances, and is suitable for areas with hard water quality.

Water purifier: also known as direct drinking machine, high precision filtration system, effective filtration of tap water, can be directly drunk.