1.Kuchokera pa mfundo yosefera ya ultrafiltration membrane water purifier (UF) ndi RO water purifier, onsewa amasefa madzi kudzera mu membrane ya polima.
Chotsani zonyansa m'madzi.

2. Kuchokera ku kulondola kwa kusefera kwa nembanemba ya ultrafiltration ndi nembanemba ya RO, kulondola kwa kusefedwa kwa ziwirizo ndi kosiyana.Kulondola kwa kusefera kwa nembanemba ya ultrafiltration ndi 0.01 microns,
Kulondola kwa kusefera kwa nembanemba ya RO ndi ma microns 0.0001.

Madzi apampopi oyeretsedwa ndi nembanemba ya ultrafiltration amatha kuchotsa zonyansa monga matope, dzimbiri, ma colloid ndi mabakiteriya,
Pa nthawi yomweyo kusunga mchere choyambirira ndi kufufuza zinthu m'madzi.

Pambuyo pa kusefera kwa RO nembanemba ndi kuyeretsedwa, madzi oyera okhala ndi mamolekyu amadzi okha omwe atsala amapezedwa, omwe sangangochotsa matope, dzimbiri,
Colloids, bakiteriya ndi zonyansa zina zovulaza, komanso chotsani mankhwala ophera tizilombo, zitsulo zolemera, ndi zina zotero. Olansi RO Water Purifier W4 (mapangidwe a Reddot aperekedwa)
Palinso chinthu chosefera chotsatira pambuyo pa kusefera kwa membrane wa RO, ndikuwonjezera mchere ndi kufufuza zinthu zomwe zimakhala zopindulitsa m'thupi la munthu.Chapadera kwambiri ndi strontium.
Strontium imayang'anira kuyamwa kwa sodium ndi calcium m'thupi.

3.Ultrafiltration membrane madzi oyeretsa nthawi zambiri amagwiritsa ntchito kuthamanga kwa madzi apampopi kuchita kusefera popanda magetsi.RO madzi oyeretsa chifukwa kulondola kwa kusefera ndikokwera kwambiri,
Kusefa ndi kuyeretsedwa sikungatheke pogwiritsa ntchito mphamvu ya madzi a pampopi pawokha, choncho nthawi zambiri amafunika kupatsidwa mphamvu ndi kukakamizidwa kuti akwaniritse kuyeretsedwa ndi kusefa madzi apampopi.
Kuphatikiza apo, oyeretsa madzi a RO nthawi zambiri amatulutsa madzi oipa.Kupyolera mu kuwongolera ndi kusintha kwaukadaulo m'zaka zaposachedwa, chiŵerengero cha madzi oipa cha oyeretsa madzi a RO chachepetsedwa kuchoka pa 3: 1 kufika pa 2: 1 kapena 1: 1.