The water filter and pump are in the cavity behind the return air grill under the rear bunk. Open the grille. Poke your head in and look to your right. You should have gotten a filter wrench in your owners packets.
Can you all tell me where the water filter is on the 23IKSS?
Kellie, it is inside the door on the outside back of the trailer. When you open that access door there is a false wall. You need to take the screws out to remove that false wall and the filter is behind it.