Each of your drip irrigation zones is equipped with a drip setup located at the valve for that zone. The drip setup consists of a small regulator to reduce incoming water pressure and a filter that screens junk out of the water so that it can't plug the emitters. Drip regulators don't need service. However, regular cleaning of drip filters is essential, especially if your water is on the dirty side. Unscrew the canister using your hands. Carefully remove the cartridge, keeping dirt from falling into the open filter body. Wash the cartridge at a nearby hose bib, using a toothbrush if necessary to gently remove gunk. Rinse the cartridge and canister, reinstall the whole business being careful not to overtighten, and turn the valve on and look for leaks.
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