if the pond smells bad it means there is a lot of organic crap in there being worked
on by anaerobic bacteria. you need to get some really good aeration going in there
and the bacteria will start breaking it down aerobically. if you use PP at about
half strength you can slowly drag a net along the bottom to start dredging up the
crud. the PP will inactivate gases that are released as you do this. I wouldnt
leave a lot of crud on the bottom if the pond freezes over in winter for very long
(where are you?). keep an eye on nitrates, dont let those climb over 20 ppm without
doing water changes. Ingrid


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