Hi all. New here, I have had a quick browse and cannot locate any previous forums relating to my issue. As mentioned I have a Grizzly Corsica hot tub. Some time ago the air valves (4No) all appeared to stop working. The pump has 2 speeds which both work. I thought it may be an air lock so after trying a few things mentioned which didn't work, I emptied and refilled the tub. This however did not work. I have since had the tub on and when removing the air valves completely and expecting water to come out nothing. I also have a waterfall and when removing the air valve water comes squirting out of that, any help is appreciated.
Steve