I artificially started my siphon today on my two year old 5 acre pond in order to do some work around the shoreline. It has ran several times naturally over the last two years. It has been running for about two hours as of now and has been spewing out thousands of gallons of murky dark nasty looking water that flat out stinks. It is emitting that dirty/mud/sewer type smell. I have watched it run in the past and not noticed the smell or the dark water, but that was always after a substantial rain. It ran on its own about two weeks ago and the intake is about 8' deep and 5' off the bottom. The pond water is by no means clear at the top as it has about 16" of visibility due to clay/dirt particles. Is the nasty water/sewer smell normal? I know its supposed to get rid of the nasty water on the bottom of the pond but dang I didn't know the water down there was this nasty...?