The flow problem is happening because water is literally not flowing through the pipe. You probably see a "FLO" error code on your hot tub panel/display. It could be lots of different things, and I go through them in this video.

I made this video for the next poor soul who is trying to learn everything there is to know about their hot tub. I have an "Adventure Hot Tub" by L.A. Spas. More importantly, the control board is a Gecko IN.XE-5-11-H4.0.

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