Hey there, heyred52, and welcome to the Pool Forum! I don't know what that stuff might be. It sounds kind of like what some people who use Baquacil sometimes complain about -- a type of water mold. But, I don't know. Maybe Ben will have an idea what it could be.
Can you post some current water testing results for us to take a look at -- taken with a drops-based kit, no 'guess strips.' Also, tell use what type of filter you have and exactly what all you have used in your pool, this season and last summer. (Ingredient names, not just 'shock.' Then, somebody here might be able to help.
If you can get a good picture of a close-up of the stuff that might also help. Send pics to poolforum@gmail.com and reference the URL of this thread.
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