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Does the light shine through this film? Does it in anyway stop the water flow? I don't see any sealant on the TR spa waterfall so I wonder if it is just some silcone which is used under the waterfall plastic slot.
WEll, you can certainly try a photo or your dealer will help. How old is the spa? I doubt this is anything to worry about though as long as the light comes through it fine. But I will be happy to look at the photos. send em on.