DIED said "another factor w/ clay size particles is ionic attraction. silt and sand settle, but gravity may have little to no affect on the clay depending on the water chemistry. "

True but ionic attraction is a countering force as noted above and is thus accounted for in my comment. Plus % wise only a small amount of ponds (I would guess less than 15%)have long term clay turbidity. Bruce's sure doesn’t sound like one of them with all that limestone.