Does the Oh Yuk product not flush the system? I thought that was what I was doing when I used it. I used more and waited longer than suggested.

I did just flush the system. I used this and let it sit for about 4 hours, then emptied out all of the water. Filled it up the next day.

My city does have fairly hard water. I tested the water though and the levels of TA and pH were in the correct zone on the scale. So I'm not too sure why my hot tub is so high.

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I think I'll just keep adding more pH down to see if that fixes anything. I'm very new to this... I wouldn't have bought a hot tub on my own so this is an interesting project.