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Message: [QUOTE="Jhn, post: 370132, member: 9612"] I see numerous issues contributing to the green water. Here are a few ways to solve it. Increase flow in pond, you need 1.5-2x volume per hour. For a 4500 gallon you would want 6800-9000gph in turnover. Secondly , Some like the uv clarifier, I don't. As it is only trying to solve a symptom green algae and not the problem, excess nutrients. It can actually contribute to the problem as it is just killing the algae cells as it passes the uv light them dumps them back into the pond. Don't dump chemicals in the pond , it kills the algae, but then the algae just dies in the pond dumping all the nutrients it absorbed back into the pond to start the cycle all over. Same as clarifier treating the symptom not the cause. Cut back on feeding they will find stuff to eat in the pond. They don't really need to be fed twice a day, to me once a day is fine as long as they are consuming all the food 5 minutes or so. I feed my fish few times a week even in the summer. You are still overstocked abit with 10 14-20" koi, keeping in mind they get much bigger than this and as you found out reproduce. Stop emptying and scrubbing your pond every spring. You basically are ridding your entire pond of the biofilm it developed and are essentially starting over. You are better off waiting until the weather warms some and cleaning out the bottom of the pond witha net and/or pond vac. Don't empty it to do this. Make sure you have plenty of plants to out compete the algae for nutrients and essentially starve it out. One way to do this is turning your waterfall tub (depends on size of tub) into a bog, addy1 has a stickied thread in the pond construction section on how to build this. Or even add a larger tub/stock tank to do this. You can beat the green algae, just takes getting your pond in balance and healthy. Once done it will be a lot less maintenance on your part. [/QUOTE]

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