most of what they call hard cod is actually a lot of phenols and polyphenols. like coffee has a hard time. or germicidal soaps. what you need to try is chem5. instead of buying microbes, you should try a small bioreactor. this way, you won't have to buy microbes again. and it also eliminates sludge and lowers ammonia. take a look at this one minute video. https://www.youtube.com/watch?v=Al7UHDb6zoU
Published by Eros Kaw, Biocleaner Inc. - Chief Tech Support
most of what they call hard cod is actually a lot of phenols and polyphenols. like coffee has a hard time. or germicidal soaps. what you need to try is chem5. instead of buying microbes, you should try a small bioreactor. this way, you won't have to buy microbes again. and it also eliminates sludge and lowers ammonia. take a look at this one minute video.
https://www.youtube.com/watch?v=Al7UHDb6zoU