I am purchasing a house with what looks like a waterfall into the pool. I can't turn the pump on because the filter has a crack in it but was curious if you can help confirm if this is a waterfall? Would it most likely be the return water line from the filter that would be pumped through these hole s that run along the top of the concrete wall? Sorry for my ignorance....As you can see from the pictures I am going to have my work cut out for me getting this pool back in shape, fortunately I came to the right place.