I would say a eco-system pond is as near to a natural pond as your going to get Maria the type of pond Meyer creates for people with his pond business but I agree 100% with what is being said on the koihealthifo site
When we do a water change we change approximately 30-40% of the ponds water
However I find I have to agree with what your saying about ponds and water changes perhaps Meyer will fill us in a little more on his ponds, he was rather scathing of the anoxic system saying it didnt work but when I ran KKU Dr Novak was more than happy to share his results with people and I know of a working anoxic pond run in Plymouth by one of our members here on the forum
Dave
When we do a water change we change approximately 30-40% of the ponds water
However I find I have to agree with what your saying about ponds and water changes perhaps Meyer will fill us in a little more on his ponds, he was rather scathing of the anoxic system saying it didnt work but when I ran KKU Dr Novak was more than happy to share his results with people and I know of a working anoxic pond run in Plymouth by one of our members here on the forum
Dave