The filter with moving bed filtration, the water enters the filter at high velocity & spins unique Kaldnes K3 biomedia chaotically around the bio-module. A set of venture introduce oxygen to the water. The beneficial bacteria thrive in this oxygen rich environment breaking down harmful pollutants at a very efficient rate. The dynamic nature of the moving bed ensures that the ammonia & oxygen in the water is evenly distributed among the biomedia so all bacteria can thrive & work efficiently. A sludge drain is built in for easy flushing of any waste build up. The Trinamic delivers excellent water purity for healthier & more active fish. Available as the Trinamic filter only or as a plus version which comes complete with a Titan water pump & Vorton UVC. This is the 12500 litre model filter. We think you will like with this a Blagdon Koi Air 25 Pond Air Pump So, when you buy from Seapets we will give this to you free as well! Add this filter to your shopping basket & the free item will appear there. It is easy to remove again so there is no commitment, just the best online offer.plus free accessories, plus free Seapets Pointsplus free Delivery