12500 liter koi pond located i west coast of Norway, the pond is round vortex shaped bottom w/drain and about 1.2 m deap. Uvc heater, air, shower, mating and different other different filtrations, planting to install drum filter in 2022 ant modefication of the pond if i get time. The pond was quickly built in 2008 and are avaiting owners start of rebuild or make a new and bigger pond. :)