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The Progard® TL1-C pretreatment pack is designed for use with larger Elix® 20/35/70/100 and RiOs™ 30/50/100/150/200 water purification systems. The pretreatment pack protects the reverse osmosis (RO) membrane against mineral scaling, organic fouling, and chlorine oxidation by removing large particles and free chlorine from tap water. The pack includes polyphosphates, silver-impregnated activated carbon, depth filtration and ROProtect CR for automatic RO maintenance.