after two days work, here are the pictures:
old situation:
temporary extra air:
temporary place for my filter:
the old 200 liter vortex and the new 500 liter:
losing water out the pond for improving bottomdrain:
new, botomdrain and skimmer coming together with valves to reduce the flow:
new vortex in place, on the right site you can see the pipe that goes to the plant pond:
from the other site, in the front, the new filter and in the background you can see first the koi pond and behind the plant pond:
the only thing I have to do is reconnected the 3 chamber filter between the pump in the plantpond and the koi pond, but I have to wait untill next thursday because my pvc supplier is out of 50 mm curves and pipe (I already bought everything he's got haha)