pepetj wrote:
Using or not activated charcoal is a personal choice.
Using activated charcoal is not risk free: If not replaced timely it will release back to the water column most of the impurities it captured while "active". If for whatever reason I ran out of replacement I take out the "due" charcoal and leave the tank without it.
Pepe
Santo Domingo
ha ha ha, you missed one point pepe. in tropical country, you can wash the activated carbon core, leave it under shearing heat of sun for several days, and it will ready for re-use. (of course with shorter duration) same effectiveness.