And then you clean it and move it - it becomes a bomb. But if you do not move it - let it be in the tank it is. It still is as dirty as before but in your opinion its not a bomb - that´s the logical somersaultNot sure I understand what logic you don't get. Old sand beds accumulate organic waste. Ceptic tanks accumulate organic waste. That is why I enjoyed the post by FishThinkPink. It was a fun analogy in my opinion.
Sincerely Lasse