This is probably the result of very hard water. I thought the same in my first Class A...1 year and I had restricted water flow; looked at the screens and there was sediment. Cleaned them with vinegar and blew them out (as well at the plastic disc that some have to "spread" the water). All was well after that EXCEPT...if you have one...the macerator toilet.
About three months later, I wasn't getting the fill I though I should after the flush. Turns out in back of the macerator toilet, there is a solenoid based pump that also has the same screen and disc in it that a faucet has...yes there was sediment there as well. Blew it out...the macerator toilet was suddenly filling as it should. Hope this is helpful. BTW, I now have a water softener (or you can use a RO system)...the house filters just don't collect all the particulates/sediment.
Dave and Beth
2015 Cornerstone 45J
Ford F-150 and 2016 Polaris Razor