I cleaned the filter and I guess I failed to tighten something properly. Turned the pump on, watched the pressure build and then... You remember those water powered rockets from you were a kid? I recreated that on a massive scale. A bit of water started to spray out and them a massive BOOM. The top half of the filter went somewhere between 30-40 feet in the air, over the house into the front yard. I would guess this thing weighs around 20 lbs. Neighbors came out and I hid inside out of embarrassment. When they went in, I retrieved my filter. Time to read the manual.
I am guessing I didn't have the gasket seated properly or I didn't tighten that ring enough.