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3 . 6 Maintenance Route Frequency: Weekly <br /> pH adjust. tanks: - Inspect the pH #1 adjust. tank,pH #2 <br /> adjust. tank, and pH #3 adjust. tank <br /> for leaks and damage. Clean if <br /> necessary. <br /> - Inspect the lightnin mixers for damage <br /> and mis-alignment of propellers. Re- <br /> torque the driven gear bolts if <br /> necessary. <br /> - Inspect the 3-way solenoid valves, <br /> caustic feeding valves, and PVC true <br /> union ball valves for leaks and damage. <br /> - Inspect the pH probes for obstruction <br /> and damage. Clean if necessary. <br /> - Inspect the 3-way diverting valve for <br /> smooth operation and damage. <br /> Caustic tank: - Inspect the caustic tank for leaks and <br /> damage. Clean if necessary. <br /> Inspect PVC true union ball valves, air <br /> shut-off valves, filter/regulator/ <br /> lubricator, 2-way air solenoid valve, and <br /> air diagram Wilden pump for leaks and <br /> damage. <br /> - Inspect the Kari float switch inside <br /> the caustic tank for obstruction of <br /> float. <br /> Check the electrical circuit as <br /> required. <br /> Acid tank: - Inspect the acid tank for leaks and <br /> damage. Clean if necessary. <br /> - Inspect CPVC true union ball valves, <br /> and acid metering pumps for leaks <br /> and damage. Re-adjust the acid metering <br /> pumps if necessary. <br /> Inspect the Kari float switch inside <br /> the acid tank for obstruction of float. <br /> Check the electrical circuit as <br /> required. <br /> 3 . 7 Troubleshooting Symptoms/Causes <br />