I have a 14 year old pond that has worked well. Last year it was perfect! Clear water, healthy fish and beautiful water lillies all summer. But this year it is a mess. Very overgrown, muddy, no fish ( perhaps heron got them or else they are dead at the bottom), very few flowers on the lillies and they are all speckled with what looks like grey dust.....and worst of all lots of bluebottles! Should I empty it and start again? I have no pumps or filters.
My small pond 5ft. by 2.5ft.and 18" deep has become muddy and slimey. The slime adheres to the plants (oxygenater, Lilly and Iris) and also floats in lumps on the surface. There were fish in it up to 5 months ago when the heron got them all. It is generally very muddy and disgusting. I have a filter in it but have switched it off for the moment. Should I empty it and start again or is there any treatment for it. Looking forward to hearing from you. Thank you.