Water and campers do not mix. The construction materials on the inside of the camper are not designed to get wet. Make sure you mop / shop vac all possible water and run a dehumidifier to ensure all the moisture is out of the walls and floor. Don't know what you mean by flood, but better overkill than sorry.
What is the make and model of the purifer and where is it located? If it is the new PUR KW-1 cartridge filter, sounds like the canister is not attached properly, or may even be damaged.
2014 Flagstaff 27RLWS
2004 Chevy Avalanche 2500
1998 21' Thor (doesn't everyone need 2 TT's?)