In lagoon and in some lacs and ponds, the organic sludge settle in the bottom reducing the volume of the water ponds. More important, when this sludge is not stabilised it will create odours and process perturbation due to anaerobic sludge.. Anaerobic decay produces toxic gas which will come some or later in the atmosphere. The methane gas has a very negative effect on greenhouse gas…that humanity try to reduce for avoiding climate change. Anaerobic sludge degrades water quality and if nothing is done the water purification won’t work optimum and create many health issues. It’s time to move!