What size rocks or gravel are recommended for best efficiency?I'll second that. A shallow layer of gravel on the bottom is an integral part of the biological filtration of a well-balanced pond. In 7 years we have never had a need to vacuum our pond bottom.
we call it gunk but in thin layers in a closed environment is called heaven to bacteria. and other micro organismsI have never put gravel or rocks in the bottom of my pond. I think it just gives a place for more gunk to get stuck.
What size rocks or gravel are recommended for best efficiency?
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