I made my pen cleaner out of abs pipe ,a tee fitting and reducers to hook hose up.and a screw open clean out fitting
I use pool pucks in it.
Take 4 ' of abs. Cut into two pieces 3' and 1 ' put tee between them with cement.
1' piece is top. Glue clean out on open end of 1' piece.
Put reducers in tee down to size of hose fitting this is the water intake
Reducers on bottom open end of 3' piece and this is the out take.
A pool puck lasts almost two weeks with daily use and large volumes going through.
Never had a problem on kennels but did corpse roofing sheeting I had on wall in one section. Changed it to puck board and no issues. Forgot to add. A piece of vinyl sheet must be cut to inside diameter of pipe and holes drill to
Act as screen to keep puck from blocking out take. Takes a couple minutes with a drill and jigsaw
Cost around $20 in abs pipe and fittings. Then I buy pool pucks by pail when on sale or season end clear outs.
Used this for 20 years now