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Marquis E660 "Bubbling" inline dispenser

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MarKee:
Sounds normal to me, there are 2 black ports in the bottom of your 660, one is a return for the ozone, and one is a return for the SpaFrog inline cartridge system.  You will get some air bubbles coming out of these ports, it's more than likely the ozone port that the bubbles are coming out of.

pRox68:
@MarKee, I believe the 660 only has the floor drain (small gray fitting in the footwell) and the inline dispenser fitting (small black fitting in the footwell).  The pressure coming out seems less than half that of any jet at low pump speed.  Its just a bit strange that this fitting would be used for anything if the inline dispensing system was not installed on the tub.

MarKee:
If your 660 has the built-in SpaFrog in-line, it will have 2 black/dark gray ports somewhere near the bottom of the footwell. If your 660 doesn’t have the cartridge system built in to the side of the spa, it will only have 1 black port for the ozonator. If your spa doesn’t have an ozonator, there is still always plumbing for an ozonator, and you will still probably see water/bubbles coming from a black/dark gray port in the footwell.

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