ChandOne

Thanks for the responses - I've looked into this more, and I think what I have here is an air intake valve. I tried blocking this valve completely, and noticed that the jet output changed - less air was mixed in. I then tried unblocked the port and placed a piece of paper in front of it while running the jets on full. The result - there was a great deal of suction visible. I started looking around for info on what could cause water to come out an air intake, and saw a post somewhere that mentioned a clogged jet could cause this. Question: Are there any other possible causes of what I'm seeing? Also: How do I go about fixing a clogged jet? Do they typically clog at their outlet, or somewhere inline? Thanks!

I'm a newbie hot tub owner - There is a white pvc plastic port (approx 1" diameter) outlet in the base of the molded insulation, right behind the pump, in about the middle of the control chamber. I just purchased this tub used, filled it, and starting heating last night. This morning, I messed with the timer control (where you set which hours you want the tub to be on), then switched the freeze-control/timer control switch from timer to freeze (to what it would do), and that white pvc port opened up, dumping about 150 gallons of water directly into the control chamber. I tried switching this switch back to timer, closing the shutoff values on the hoses, and everything else I could think of to stop all this water waste, and it wouldn't stop. What is this port, and does anyone know how I can shut this thing off - not to mention, how to I make sure it doesn't dump all this water again? Plus, why did it stop after about 150 gallons? I just assumed the entire freaking tub would empty. Thanks!

I'm not sure about your spa, but on mine there are bleeder screws on top of the pump and filter. It should be a pretty large screw, probably metal, and located right on top of the wider part of the pump. With the jets running on low, back the screw out a bit until you hear the hiss of escaping air. Once that turns to water, tighten the screw. You may need to repeat a few times, and sometimes switching from high to low jets will push some more air out