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Hello, I live in Seattle area, and have a little round 250 gallon spa that my husband and I use quite regularly on both good and bad days - except when it's windy as one year a branch fell down and skewered the lid! I searched for a hot tub forum and found you. Thank you for being there.

I was a month or two late cleaning the hot tub as I've been a bit overwhelmed lately. Anyway, I finally set about cleaning the tub today and found this incredibly weird grey beige stuff all up in the filter. It is odorless and has the look and consistency of papier-mâché (see photo) I...