Hello all,You need a UVC fitting to your system. Ultra Violet Clarifier - you'll have high Nitrates in your pond feeding the growth of floating algae - the most common way is to fit the UVC which basically forces the algae to clump together making it large enough to get caught by your filter.

Thanks.

I didn't find the right solution from the internet.

References:

- https://www.pond-life.me.uk/forum/viewtopic.php?f=27&t=16495

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