Dog pooooo

Each pen has concrete block walls, the slab is slanted from front to back and then from right to left. Each wall has a 3"x3" hole in the bottom of the block at the back so that all the poo sprays to the back of the pen. It then flows down the back wall through the hole and into the pen to the left. Repeat on that pen until the very last pen. Then I have a drain box with a grate built into it on the top. I formed it in prior to poring my slab so it is flush with the slab. Spray poo into drain and it flows into the septic. If I confused you I can take pictures for reference. It works awesome. No poo touches outside of the pens and there is minimal smell. Only thing you really smell is what don't get sprayed out of the drain box.