[quote=keokoi]
Marco, how is the water rreturned to your pond now? Is it pressurized into TPR or where you fish get good turbulance and excerices. I would think that you would want to not disturb that part of your pond. The gravity return will not do this work for you.
PLease tell us more...
Actualy one of my water filter return by gravity into a little fall and the other filter is gravity feeded and the water return to the pond with a pomp,that water arrive at mid level in the pond and can be directed in different direction that I change often. The koi seems to like changes ..