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Thanks Mike / B.Scott
I have already set up two extra filter boxes filled half way with alphagrog / gravel that are flowing back into my pond from a split return before the venturi. This is an add on to my set up to try and remove the phospate content to stop or inhibit the blanket weed without using chemicals.
I appreciate everyone's help and views on the matter and still wish for people to express opinions. But I do know other Koi pond owners in my particular area that use veggie filters as an add on have significantly reduced blanket weed.
If it works I will have achieved my goal, if not I have wasted £25 in trying that I would have spent on chemicals anyway and I will give you the satisfaction of saying "I told you so" by posting my results
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