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