Can you supply numbers for ...

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Can you supply numbers for the water going into the SBR. Also, have you checked to see if there is the right balance of nutrients. What is the foam like?

Quick answer - Adjust pH, keep under air longer, hold back some waste for seeding.

Root cause - C:N:P not in balance, Food to mass ratio too high, Sludge age too young.

Would agree with Zainul Shiekh below.