Brush-able brown spots can be mustard algae, or can be dirt being forced through the filter. Persistent brown spots are often iron stains.

Steps to follow:

1. Get a K2006 kit; to manage either algae or iron . . . or your pool, you need accurate testing. => http://pool9.net/tk/

2. Do the DE test to see if your filter is 'leaking' -- this is a VERY common problem on AG pools with BIG pump and little filters. => http://pool9.net/de-test/

3. Test your stains or dirt to identify what they are. http://pool9.net/stains-id

4. Make sure your chlorine is high and your pH is between 7 and 8: you do NOT want to get algae or have other problems while you solve this one!

5. Report test results once you have them.


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