Locate the sprinkler head that appears to be clogged. Irregular water patterns or reduced water pressure are symptoms of clogged sprinklers.
Remove the retaining cap around the top of the sprinkler by turning the cap counterclockwise until it releases from the sprinkler body.
Pull the cap and the pop-up assembly out of the sprinkler body.
Pull out the small ring that contains a metal mesh from inside the pop-up assembly. This is the filter.
Gently scrub both sides of the metal surface of the filter with a nylon brush to remove dirt and other debris.
Run the filter under water for 30 seconds to clear away debris.
Place the filter back inside the pop-up assembly.
Place the pop-up assembly back into the sprinkler body and tighten the retaining cap by turning it clockwise until tight.