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Before some time an intersting point had been raised about

"What time can sponge filters be kept off without killing the biomass within
the sponge and
 What time is required for the biomass to develop again if the air-pump is
not started in time?"

This is very important as the wear and tear of the equipment depends on time
of usage.

I hope somebody does answer the question this time.

Dr Athale,
Baroda, India.