About a month ago I drained my pond and cleared all the mud out of it. The water stayed clear for a while. Then in the upper pond I discovered a mass of mud. I know it wasn't there before I worked on the pond but it is now. Anyway the mud is ontop of pea gravel so the only way to get rid of it is to drain the lower pond AGAIN and wash the mud away. I'm going to wait for the weather to get cooler. There's no point in working on the pond in 100 degree heat. Bummer.