Currently quartz sand is generally applied in water purification system, activated carbon is used to be the pretreatment, but during the period of pretreatment, damage of activated carbon is extremely easy because of adsorption saturation (the life time of normal activated carbon is 6-12 months) .So the service lifetime of RO membrane in next treatment level is shorten, and the cost rises. RO membrane is afraid of chlorine and scale, while chlorine can make a film age outside to break and lose purification ability. For example, Fe2+ can poison ion exchange resin and make it lose the ability of regeneration.

The application of KDF can lenghten the service lifetime of RO membrane by 5-10 years, removing residual chlorine and Feion.。

Therefore, KDF filtering material is able to be put into use together with quartz sand barrel or activated carbon barrel in handling in the pretreatment, which can control formation of bacterium and scale, also remove chlorine, heavy metal. now that the life time of activated carbon , may prolong and so dose next equipment.

KDF filtering material can be applied as many water pretreatments, protecting next water treatment acilities such as: bakery and confectionery , beverage factory , pharmaceutical factory, bathing water purification equipment and so on.