... is not necessary. Simple pre-treatment crafts include multi-layer bed filter, softener or anti-incrustant dosing ... completed pre-treatment crafts include floculant dosing station, multi-layer bed filter, active carbon filter, softener or ... partial countries, so it is needn't use multi-effect water distiller.)Equipment characteristics: Manufacture time: It is ... , SAT, DQ, IQ, OQ, PQ ect. RO water purifier