It was recommended on this site last year to use watercress and it did help. Also the fish enjoyed nibbling it. Welshonion, you mention not to use it - what problems is it known to cause?
I have given up on buying water lillies as they always get covered in black fly.
what great advice, water cress in filter..will try that and treehugger i have put barley straw in a week ago and i think its made a difference already.
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It was recommended on this site last year to use watercress and it did help. Also the fish enjoyed nibbling it. Welshonion, you mention not to use it - what problems is it known to cause?
I have given up on buying water lillies as they always get covered in black fly.
Many koi keepers use watercress in their filter systems rather than the pond itself, it does need flowing water to grow well.
what great advice, water cress in filter..will try that and treehugger i have put barley straw in a week ago and i think its made a difference already.