Use the winterizing bypass assembly at the pump to run a few gallons of vinegar through your system. Next season remember to drain all the water lines as well. as it looks like you have a calcium build up in them.
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12