All has been well with the pool here. I had the filter running today and had the kids in the pool a few hours earlier. About an hour ago I went to wash my hands and as I looked up I noticed through the kitchen window that the pool water level was just to the bottom screw on the skimmer. It was above the second screw earlier in the day. I ran outside to see the hose that connects to the pool was laying on the ground gushing water as well the return hole. I shut off the pump and reconnected the hose to the return. I just finished refilling and turned the pump back on, there seems to be some air in the system so I bleeded out on the filter. I did notice the hose from the filter to the return seemed to be shaking, not sure if I've seen this before and am just noticing it now or what. I turned it off just incase, I'm wondering if air is still trapped in there.
Any idea what caused this to happen and what is the best way to prevent it in the future? If I was not home at the time I think it could have been really bad, pump running dry, liner tearing etc. It is really really hot here today, water temp is now 90 degrees (this is after refilling like 6 inches with the hose). I feel like the hose was secure, we spent some time adjusting it back in April when we opened the pool and haven't had so much as a drip since then.