I had similar experience with particles of plastic material. The first time was within 6 months of owning our 2017 (YACHT OLIVIA)...I noticed that our toilet was flushing slowly on city and water pump service. While at the 2018 Oliver Rally, I called its attention to Jason and his crew and they brought me a new valve, which I replaced once at home a week later. Then after returning home from the Rally, our faucet in the bath was slowing down using both city and water pump service. I then called Oliver and Jason sent me a new faucet for the bath, which I replaced myself.
Now about one year later, I am down to a trickle both on city and pump service. I thoroughly troubleshot the water pump (including checking the very clean water filter between the fresh water tank and pump) and all the line valves and discovered that that wasn't the problem -- my seldom used outside shower fixture flowed strongly on either service. (This was actually the first time I had checked the filter - not thinking to check during the first toilet pump filter debris.) Soooooo...my only conclusion is that there was debris in the water lines between the pump and faucet fixtures, and toilet valve. I suppose now the only solution is to replace all the fixtures (including toilet valve). Perhaps the faucets have capsules to replace, where the debris may have been trapped?
I am at a loss here. I just called and left a note for Jason on his cell phone - hoping I'll receive a call as I need to use my RV in about two weeks for a very important client show/visit. My touring season is also starting with my artists and will be on the road quite a bit. I don't want to have to tell my client(s) I am using bottled water or from an outside water source to flush my toilet and wash my hands, etc. How embarrassing will that be? They all know my YACHT OLIVIA is a class-act, high quality piece of art and technology and will probably laugh and poke fun.
Hoping for a quick and low cost solution or, a miracle?