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I’d still be a little nervous about just blindly adding acid, because again you may go too far and make the water acidic, which will also cause problems. It might be hard to do with the cover on, but if you can come up with some way to get a water sample out of the spa you might be able to...

I’d be pretty nervous about just blindly adding acid, especially with no water circulation. If you add too much you could make the water acidic, which could also damage the spa and with no circulation the acid, which is more dense than water, will just pool and sit on the bottom of the spa and...

I am really baffled by this. I can’t think of any reason why the FC reading would increase while the jets are on. Especially by that much. About the only thing I can come up with is that you are adding the chlorine while the jets are off and as such the water isn’t mixed and there is a...