Problem with small pond

QuestionsProblem with small pond
Frances Clohessy Staff asked 15 years ago

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.