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MAINTENANCE <br /> The following maintenance must be carried out for successful long-term operation of the <br /> equipment. <br /> 1. Frequent checks must be made on the level of chlorine or other biocide in the system. If <br /> chlorine compounds are used, this level should be kept at the levels recommended in the <br /> systems specifications Table. LEVELS IN EXCESS OF THIS MAY CAUSE NOXIOUS <br /> OF DANGEROUS FUMES WHICH MAY BE A HEALTH HAZARD, OR MAY <br /> DAMAGE THE EQUIPMENT, <br /> 2. Frequent checks must be made on the pH level of the water. The recommended levels are <br /> listed in the System Specification Table. LEVELS ABOVE OR BELOW THIS MAY <br /> CAUSE HAZARDOUS CONDITIONS WHICH CAN CAUSE THE FORMATION OF <br /> HAZARDOUS OR NOXIOUS GASES AND/OR LIQUIDS WHICH CAN CAUSE <br /> PERSONAL INJURY OR EQUIPMENT DAMAGE. <br /> 3. Frequent checks should be made to ensure that broken or worn parts are promptly <br /> replaced. <br /> 4. Frequent checks should be made to ensure that no leaks occur. If this should occur, <br /> immediately shut the equipment down, and correct the leaks prior to restarting the <br /> equipment. <br /> SAND FILTER BACXWASHING <br /> I. Frequently check the pressure gauges on top of each of the filters. When the sand filter <br /> pressure gauge registers 25 psi, or after 7 days, whichever occurs first, the sand filter must <br /> be backwashed as follows: <br /> 2. Shut down the circulating pump using the switch on the control panel <br /> 3. Remove the retaining clip from the slide valve, and raise the valve to the backwash <br /> position. <br /> 4. Restart the circulating pump, and operate it for a period not exceeding two (2) minutes. <br /> 5. Shut down the circulating pump, and move the backwash valve to the normal position. <br /> Replace the retaining clip. <br /> 6. Restart the circulating pump, and observe the pressure gauge on the sand filter for a <br /> period of one or two minutes. If the pressure does not exceed 20 psi, the system has been <br /> successfully flushed. If a higher pressure is registered, repeat the above steps. <br /> 16 <br />