My pond has a lot of organic matter blown in or coming in through small feeder creeks.I am using bacteria this year and using it with 24/7 aeration. The organic matter seems to break down quickly. I know a friend that has used the New Tech Bio product and reported good results. It is more expensive than other products. The Pond Guy does offer a money back quarantee on their products.
Penn State paper that mentions bacteria. Certainly not a definative study
http://bedford.extension.psu.edu/pond/Lesson%202%20FAQs.pdf


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