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Black tar like substance floating in hot tub - Dynasty Spas Aquarius-2017 Model

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CanadianSpaTech:
Check the o-rings at either end of the heater tube. Some MFG's use black 0-rings. They (black white or clear) can deteriorate over time or even get to hot and melt a bit. Take a diverter cap off and you will see an o-ring underneath. Remove the o-ring and touch/rub it with your fingers a bit and see if it is the same as what you are getting in your spa. Let us know results

CanadianSpaTech:
Pillows can also be a source

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