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9 Operation and Maintenance Pre-filters should be replaced about every 6 months or as needed based on local conditions. High sediment, chlorine or oth- er contaminant levels may necessitate more frequent service. Low sediment, chlorine and other contaminant levels may allow for less frequent service. Failure to replace the cartridges in a timely manner may result in reduced or complete loss of production and damage to the membrane and other components. Use sanitary gloves and maintain filters in a clean environment when handling and replacing. The membrane element requires consistent drain flow at the designed rate to prevent contaminants from building up and fouling the membrane sheets. The membrane can suffer pre-mature failure from lack of use, so use your system frequent- ly for drinking, cooking and other filtered water applications. The membrane should last at least 12 months and in most cases will operate properly more than 2 years. Test and inspect with each service, but the service life is highly variable. Replace as needed or every 3-5* years, whichever comes first. Typical post filters are simply polishing water that has already been filtered by the system. If the balance of the pre-filters and membrane are serviced and functioning properly, the post filter should last a full 12 months under normal conditions. Replace as needed. Specialty post filters may require more frequent or varying levels of monitoring and service. Any time a tube is removed, cut the end with a quality tubing cutter to provide a new sealing surface. Take care not to cut the drain line flow restrictor which is typically inserted inside the "A" black drain tubing closest to the membrane. Inspect the leak protection and pressure regulating methods and or devices. Replace batteries and confirm proper opera- tion. When replacing the membrane, also replace the flow restrictor and membrane check valve. It is recommended to inspect and replace as needed, the flow restrictor and membrane check valve each time the system is serviced. With each service, it is recommended to replace the 0-rings. Be sure to apply a film of appropriate silicone lubricant to the new 0-rings. The storage tank should be inspected and air pressure adjusted with each service. Use a quality low range pressure gauge and Schrader style hand operated bicycle pump to set the emptied tank air pressure at 5-7 psi. The housings should be carefully inspected at each service interval and replaced at no more than 5 years for clear and 10 years for white or other color. Replace immediately in the case of an inspection concern or event involving slightly above specification pressure or temperature. In the case of an extreme pressure or temperature event, replace the system. The system should be sanitized annually. See "System Start-Up" section for instructions. *3 years is recommended in most applications since the membrane is not sanitized during the sanitization procedure. Common Tank Sizes and Estimated Capacities Total Capacity =Usable Capacity Diameter = Height = 1 gal. .6 gal. 6" 9" 2 gal. 1.2 gal. 8" 12" 3 gal. 1.8 gal. 9" 16" 4.5 gal. 2.8 gal. 11" 16" 6 gal. 3.6 gal. 12" 17" 10 gal. 6 gal. 12" 22" 14 gal. 8.4 gal. 15" 26"