I suspect the little filter just before the pump is to catch any small contaminates that could be in your tank.
Scale from hard water is most likely, but if you are keeping your tank and lines clean, you should be fine.
If you see your pressure dropping, or the pump not shutting down like it should, maybe there is something in the valves in the pump.
Happy Glamping.
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Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!
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