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7. If after three attempts, the correct values have not been noted, the likelihood is that the <br /> sand has become permanently fouled, and may have to be replaced. <br /> POLISH FILTER MAINTENANCE. <br /> If insufficient water is being delivered from the system, the likelihood is that the polish filter has <br /> become fouled, and cleaning is required. If this occurs, follow the following procedure. <br /> 1. Shut down the circulating pump using the switch on the control panel. <br /> 2. Close the feed valve from the treatment tank to the circulating pump, and drain the polish <br /> filter using either the outflow or the filter drain (Refer to the appendix section for details) <br /> Open the air bleed valve to allow air to enter the filter, and the filter to drain. <br /> 3. Loosen the "V" clamp on the filter, and remove the top of the filter. Remove the filter <br /> element. <br /> 4. Clean the filter element as recommended. <br /> 5. Replace the filter element in the correct position, referring to the "TOP" and "BOTTOM" <br /> instructions on the element. Replace the plastic ring on top of the element, and replace the <br /> top of the filter housing. Replace the "V" clamp, and refer to the appendix for directions <br /> for correct tensioning. <br /> 6. Close the drain valve(s) from the filter, and open the supply valve from the treatment tank. <br /> 7. Start the circulating pump, and follow the directions for air bleeding in the TESTING <br /> section of the manual. <br /> 8. If the amount of water being delivered from the filter is still insufficient, repeat the <br /> cleaning steps. If this is not successful, then the filter element will have to be replaced. <br /> CHECKING CHLORINE AND pH LEVELS. <br /> In the beginning, frequently check both the level of pH and the level of chlorine of the <br /> water in the system. Adjust the levels to those recommended in the System Specification <br /> Table by adjusting the metering valve on the chlorinator, and by adding pH adjustment <br /> chemicals. Refer to the manufacaturer's information about these chemicals. Frequently <br /> check that chlorine tablets remain in the chlorinator. <br /> 17 <br />