Neighbor had one installed (for the sprinklers), was a simple filter cartridge with a CLEAR cover, mounter above ground at the inlet to the valve assembly. With the clear cover it was easy to see when the filter needed to be changed. i have no idea of the cost, and they have moved. Parts for a DIY installed would easily be well below $100.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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