Hot Tub, works now

After starting and stopping the pump 100 times the trapped air escaped and the spa works. I ordered a new filter C-4950. However, the tub appears to be a special luxury which requires special use habits. It heats up very very slowly, so it makes sense to keep it hot. This is what these thick heat-insulating covers are for. It is unknown at this time just how fast the heat escapes, and thus, how much electricity this thing eats when in operation. I'm considering draining the water a little and refilling it with the hot water from the house heater. It has to be flushed anyway.