Lars has 2 ponds, one koipond and one lily’s pond.
The koipond is about 70,000 liters, built with rubber sheeting. It has two aerated bottom drains with two vortex, a chamber with japmat, a chamber with K1. All this is powered by two 15.000-liter pumps.
A protein skimmer is powered by 13.000 liters. The pond is about five years now.( the small pond in the picture is lily pond)