The filters help keep the junk from destroying the actual sprinkler. Also, they allow you to adjust the distance the water is spraying.
I hate trying to tune someone's irrigation system and finding a previous technician (using the term loosely) has removed all or some of the filters. Often the same 'tech' disabled the rain gauge or solar sync as well, because "it doesn't do anything". Beware of anyone using this language, as they probably don't know much more than you do about your system.
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