Hello! I am at a loss as to what could be causing the following problems. I have had a pool since I was little, and I have never encountered this problem. We replaced our pool 2 years ago. With it came a sand filter(which was new to me) I prefer a DE filter, which I will be replacing it with shortly. In the meantime I am having issues with I think the pump. The pressure and everything is fine on normal filtration. However, when I go to vacuum, after a minute or so, the pressure from the return decreases dramatically and the pump loses almost all of its water. I have made sure that there is no air or leaks in the vacuum hose. I have been vacuuming pools for about 20 years and have never had this happen.
My husband checked the pump and everything looks ok. The pool expert that I go to thinks it's the vacuum hose, but I've tested it. Maybe I just need to get a new one. It's very frustrating as the pool is clear, but there is debris and leaves on the bottom.
Thanks in advance for any suggestions!