my old pond would do the same thing most warm months. it was down in a hollow and didn't get much wind, but when it did get really windy it would seem to temporarily clear it up. i could also ride around in my little boat with the trolling motor and tell that i was stirring it up. what i am getting to is that it seemed to only be the top few inches.

my new pond had an odd color once this year. from a distance it had a kinda hazy blueish green color. within a few days it got really clear. i assume some type algae bloom died.

Scott Hanners