Anyone who has a pond of any kind will sooner or later encounter green water. In this video I go through why pond water turns green and what you can do to minimise the chance of it happening to you. I will give you a quick fix to get rid of it quickly in an emergency and also some options for clearing it and stopping it coming back long term.
There is a section on UV systems for koi ponds with some information on different options, how they work, and how to choose the correct one for your situation.
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