C hecking out my koi pond today found that the pond water clear up further. I am now able to see the base of the 5 feet deep pond very clearly. This is an indication that the bio filter of the Vortex has kicked in. From this point onwards, I will increase feeding and consistantly feed 3 kg of koi food daily to my koi for the next few weeks and monitor the water quality regularly. We shall see if the Vortex is able to cope with this load.