My friend lost her fish one spring....her ammonia was high, they emptied the
pond, cleaned it out, and started over.....worked well. Live fish and frogs
now. How long since you emptied it, it is amazing how much "stuff" is on the
bottom.

I only had a trace of ammonia, in the still water.....but we emptied it and had
18 inches of pine needles, pine cones, and "stuff" on the bottom built up over
the years.

Maureen