MAINTENANCE AND FEATURES: Quartz sand filter uses one or several filter media, operates at room temperature, acid and alkali, oxidation, ... pressure, the liquid goes through the touch flocculation of the media , to adsorpt, retent, remove the impurities, so as ... is generally as follows: quartz sand, anthracite, granular porous ceramics, manganese sand, the user Its filter precision is between 0.005 ...