How long can the sludge on combined packings carrier survive when contact oxidation tank emptying

It is not a matter of how long the biofilm sludge can survive after emptying the contact oxidation tank, but to avoid drying and hardening of soft fillers.

After hardening, it is difficult to stretch out again in the water, which should be prevented.

If the packing does not harden after the contact oxidation tank empties, then after the sewage is injected again, the biological bacteria remaining on the combined packings carrier will be reactivated, and the role of the life film will be slowly restored.