I do not have your model but many/most water systems send
water through the filter either way.
City water or onboard tank- both go thru the filter.
FYI, you can replace the filter unit with a "whole house" filter
from Lowes, Home Deopt or any big box home center.
Even a local hardware store will probably have them.
Good Luck & Happy Camping!
Dan & Rita D
2004 5.3L Silverado 1500 ext. cab 2WD
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch, AirLift load levelers
Camping days 2010-53, 2011-47, 2012-41,
2013-41, 2014-31, 2015-40, 2016-38