Objective   To observe effects of various kinds of water treatment devices, and select safe and reliable water purification materials.

  Methods   To put different types of water treatment devices under same conditions, experiment in succession the standard water sample for 0, 15, 30, 60 days.

  Results   Active carbon has longer filtering volume and duration, high-purity copper-zinc(KDF)less, and molcular sieve the shortest.Molecular siveve has certain purification function on inorganic substances; KDF can effectively filter heavy metals, but KDF itself can dissolve out the chemical zine with high dissolving ability.Active carbon shows a low removal rate for inorganic substances and microorganism, however can well absorb volatile organic substances and oxygen consumption within effective water purification volume.Hollow fibers can effectively filter bacteria and turbidity, while for heavy metals and organic substances of little molecules, it.s not better than(polypropylene)PP colander, which can better purify big particle substances.The device of activated carbon and hollow fibers function better in filtering and absorbing, can remove most microorganisms, volatile organics, suspensions, the device of reversed osmosis can well remove various kinds of substances.Furthermore, the device of active carbon and micro-hole membranes has higher water filtration volume, but lower purification effeciency.

  Conclusion   Different water purification materials have different effective water purification volume, and different filtration and absorption states.The water treatment device combine with active carbon and membrane filters show best water purification effect.