How much is too much ??
I have read or been told that by placing charcoal in your waterbutt STOPS the water from going off/smelling ??? In previous years I have owned & used a plastic butt without problems but this year I invested in an old wooded barrel to turn it into more of a garden feature.
But the smell even with several lumps of charcoal in the barrel is very egg like/soar. Do I just keep adding charcoal until I have rectified the odour ????