Should be one underneath in the hatch area, possibly near the hot water heater. It would likely be hidden behind a removable panel. Should be changed at least at the start of each season and will definitely need to be removed for winterization.
I removed the panel but it looks like the city water(white hose) goes directly into a T fitting on a blue line with no filters. From there the blue lines seems to run everywhere in the unit.
Would there be something else somewhere else? Maybe I don't have one?
My unit is a brand new 2018 36BHQ Cobalt package.
thanks
matt
It should be a cylindrical container "T'd" into that. I would say if it's not there, then there isn't one. You can easily fit one in. I figured the online filter was standard. My 36kstb has one.