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did you do the plant filter again? Mine is filtered by only a large bog, it is always clear and string algae freeCarolfromflorida said:years ago I made a filter out of an orange grove tub using several different layers of different size rocks. the water ran thru the rocks and then into the pond, and I also had a line of water running into a plant bog. My pond was clear. The second pond I made I tried to remember how I did the rocks and guess got it wrong because my pond is always green about 5 yrs now. Does anyone know what I am talking about and what did I do wrong? Also first pond NEVER cleaned rocks but second pond clean the rocks every 2-3 weeks.