Most likely this result could mean you've used the spa quite a bit, and haven't drained it recently. It could also be weird pool / spa chemicals have been used on the spa.
Have you been using any non-BBB chemicals on the spa? Do you cover your spa?
If you want to find out WHY the spa is like that, hang on to the water for a while. Otherwise dump it -- not into the pool! -- and refill.
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