Well . . . . that's a short question with a lot of possible answers. Here are 100 of them (literally):
http://www.poolsolutions.com/gd/100-...ool-water.html
Here's what you need to do:
#1 - Browse through that list, and see if something jumps out at you.
#2 - Test your pool and post the results -- Chlorine, pH, alkalinity, calcium & stabilizer
#3 - Tell us how you treating your pool - what chemicals you are using
#4 - Tell us what kind of pool you have, and how many gallons it has.
#5 - If your stabilizer is high, read the "Best Guess" page linked in my signature.
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