I have the 2013 Salem Hemisphere 346 QBUD and it does not have a built in water filter.
I put an Inline filter where hose connects to RV.
We got ours last July and are loving it, just need to get past next 5-6 years so can retire and use it a lot more.
2010 Dodge Ram QC 2500 HD w/Cummins Diesel
2013 Salem Hemisphere Lite 346 QBUD