My pond which we renovated in August 2015 has become super clear this fall. No appreciable rainfall since Oct 23. The FA has died back to the bottom and I would guess I have about 10 feet of visibility now. It's almost swimming pool clear. It's all clay bottom, but when stirred it settles back in a couple of hours. If I use polarized glasses I can see fish in the deepest water looking from the bank. I guess this is a common occurrence in late fall when it's dry with some ponds? My other pond right next to it has about 3 feet visibility and the forage pond has about 8 inches visibility. In the clear pond, the only debris I see on the bottom is FA clinging near the bottom. No leaves, etc, only the structures I put in. It's low, but still has about 8 FOW in the deepest flat basin. I have not used alum or any other clearing agent.