I picked up a whole house filter at Home depot for $30 (link) and swapped
out the factory one.
The GE filter has a bypass/shutoff valve so when you need to change the
filter you can just turn it off. When winterizing, I can switch to bypass
and do not need to fill the drained housing with antifreeze. Less to flush
out in the spring as well.
It is taller but it does fit with just enough room to change the filter.
GE Clear Whole House System-GXWH20S - The Home Depot