Found some info at.....of all places the Kribb:

"The foam sponge can be easily inspected for clogging or removed for
cleaning. You must clean the sponge regularly to remove the solid
wastes before they decompose and dissolve back into the water.

It is quite important that when you clean the porous foam that you do
not kill the bacteria colony through the use of detergents, very hot
or very cold water.

A safe and easy way is to rinse the foam sponge in the bucket into
which you have just drained some tank water during your regular water
change routine."

Sound right?

Chris


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