Been there, done that with the flooding
I didn't have any leak issues with the factory filter in our 2014 Roo 25RS but I replaced it with a similar type filter from Lowe's that used better, cheaper filters. Wasn't long before I had a major leak with that one and have since gone with the exterior / inline hose type filter to get away from anymore potential floods inside the trailer. To connect the two ends of pex left by the removed filter I used a flexible section of hose that was made to bridge a residential toilet tank to the wall, so far no more issues. It's a little long but just coils out of the way under the bottom bunk.
2011 Ram 2500 Mega Cab 5.7L
2014 Rockwood Roo 25RS
Nights camped 2014 - 27, 2015 - 28
Nights camped so far 2016 - 26