As the filter becomes more clogged, the water flow out of the sprinkler head becomes significantly diminished. Many pop up sprinkler heads have an in-line filter. Not sure if all brands do. I have a mix of Hunter and Orbit brands of pop-up sprinklers. As mentioned above, the filter is located below the sprinkler head. Pull up on the removable sprinkler head and grab the shaft (don't let go of it). Then unscrew the sprinkler head. The filter is immediately visible provided the last servicer reinstalled it. It is best to have a clean filter on hand. They can be purchased at Lowes or Home Depot. Remove the dirty filter, swap in the clean one and reinstall the sprinkler head. You may have to re-point the sprinkler spray pattern after doing this.
Clean the dirty filters by spraying water from a hose on it. Cleaning the dirty filter allows you to reuse it. Be sure to hold the filter tightly so you don't blast the filter out of your hand. Learned that lesson early on.
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