Thanks! If by scum layer you are referring to the crust then this may or may not be removed depending on how thick and/or solid it is. Most commonly a portion would be left behind as this is beneficial in helping the bacterial processes to continue. This tank was made from brick and concrete.
Thanks! If by scum layer you are referring to the crust then this may or may not be removed depending on how thick and/or solid it is. Most commonly a portion would be left behind as this is beneficial in helping the bacterial processes to continue. This tank was made from brick and concrete.