The filter is important if you are using rotary spray heads like the Hunter MP rotators. Once sand or a small rock gets into the head you need to throw it away since it can't be fixed. For all other heads especially the big canons, you can get away without the filter.
The best solution is to install a master irrigation filter at the source of your water at the control box. It will remove most of the harmful stuff and leave you with only one filter to clean once a month. If you live in the North where you don't use reclaimed water for irrigation then you should not have any problems since you are using clean pottable water for your irrigation.
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