I'm not sure what you are dealing with. Could you fill out the pool info chart:Pool Chart Entry Formand, list all the chemicals AND filter additives used since January?
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I don't recognize "white stringy and tan stringy stuff" as characteristic of anything. The only thing that comes to mind as even a possibility would be some of the alternative filter media, but I don't see how that would be IN your pool, rather than your filter.
Could you take pictures (in focus, please - I've got a bunch of pictures to sift through that people have sent in, but they are out of focus and mostly useless) and send them to poolforum@gmail.com, or else post them using Photobucket, Flickr, or Picasa?
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