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Date: 2012-07-03 19:01:56Hiking equipment Chemistry Bleach Home Filter Oil filter Air filter Electronic filter Water filters Technology Irrigation | Cleaning The Black Berkey Purification Filter Precaution: While this system can effectivly purify untreated pond or river water, always use the cleanest, clearest source possible when cleaning the filters. As an additionAdd to Reading ListSource URL: www.berkeyfilters.comDownload Document from Source WebsiteFile Size: 44,32 KBShare Document on Facebook |