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I did that before I drained the tub. Sorry, I should have mentioned that. I have good flow through all the jets and good suction at the suction ports. I could feel water going through the heat...

I did do this before I drained it. Sorry, I should have mentioned that. I do keep the filter clean and the water was circulating fine.

I have a 97 Cal Spa that is not heating at all. The pump is working fine. Where to start? I have drained the tub, but want to repair it for this winter.