I live in Oklahoma and it’s getting to that time of year where we get cold temps. My pool has a pump for the main pool and a water feature pump for the sheer descents. Last year I had the freeze protect set to come on at 40 degrees and heated the pool to 45 degrees before an attic storm came through. However our descents still froze up solid. I’d like to winterize just the descents so I can continue to use the hot tub through the winter. I have a 10HP shop vac but I’m not sure what valves need to be closed or what attachments I need to purchase. Any insight would be appreciated!