I have been having trouble with my sand filter. Seeing a lot of dirt in the pool. I opened the filter to do a deep clean and noticed it was less than half full of sand. Rubbed some of the dirt that was on my steps and it was sand. So pretty sure I have a broken lateral. Also when I moved in 3 years ago there were several bags of play sand in the shed. So it just hit me that the previous owner used play sand in the filter. Have a feeling this is the root of my filter problems.