Simply Koi and More Koi

Hi Andrew, Have had it running nearly 12 months and have not seen any collection of foam or tinged water.... Even had extra air on the air control line but nothing collected in the centre column only if u turn the water level up it just overspills out the top in o the bowl. Could not find any happy ...

I have one (the cloverleaf protein extractor) and it hasn't achieved anything worth talking about yet.
Complete waste of money