Another thing to check on the shower, most have a flow restrictor disk on the faucet bib where the shower hose connects. Debrise can collect there also.
Remove the shower hose at the faucet, remove the flow restrictor disk, clean out under it and replace restrictor disk (or, for better flow, leave it out) and reconnect the shower hose.
Rick & Debbie; Brandy, Dexter R.I.P., & Fritz R.I.P. (The Doxie "Kids")
2015 Jayco Pinnacle 36RSQS 5'er
2011 Rockwood Windjammer 3001W (Traded)
2013 Chevy Silverado 3500HD LTZ, 6.6L Diesel Dually; B&W Goose Neck and Companion 5'er hitch