Sissy, The blue stuff was our above ground swimming pool. Nobody but me would clean it out so I took it down. Was a hassle to keep clean. So, it became part of my pond as far as protection for my expensive liner. The pipes have little holes that I drilled that my air pump is connected to for areation. It's on a timer so it comes on during the night time for oxygen. Maybe I've gone overboard with all the stuff I have in this hobby. I don't know.
My location pond store is having a 30% off sale on 10/8 and 10/9 and going to bite the bullet and invest in an external pump. Tax returns are going to get me a Bead Filter.