Evolution Aqua nexus 310 - Page 15

Evolution Aqua Ltd
Evolution House Kellet Close Wigan WN5 0LP England +44(0)1942 216554
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NEXUS 310 GRAVITY FED INSTALLATION
come blocked. On return from your holidays - turn the bypass back to 12.00 o’clock see Fig
7.1. Normally we would not recommend leaving the lter uncleaned more then 3 weeks.
The lter can be left longer if absolutely necessary but this would not be best practice.
K1 MOVING BED MEDIA
K1 Moving Bed Media has been scientically tried and tested in sh farming and waste
treatment for over 10 years. Developed by Professor Halvard Ødergard at Trondheim
University of Science and Technology the K1 Moving Bed Media bio lm process has been
designed specically to create the most effective environment for the nitrication process
to take place. The media is engineered in a wheel shape and is slightly positively buoyant,
allowing a small amount of water ow created by adding air to the process) to circulate
the media throughout the vessel.
Oxygen and food (ammonia and nitrite) gives the bacteria the means to grow, whilst the
K1 media provides maximum surface area for the bacteria to colonise and produce bio
lm. It is this process, which removes harmful ammonia and nitrite from the water. As the K1
media chaotically circulates within the bio tank, it causes old dead bacteria/bio lm on the
outside, to be removed making space for new younger heavier feeding bacteria/bio lm
to colonise.
Within the wheel, is a protected surface, which enables colonies of bacteria to naturally
follow their life cycle, maturing and dying, in turn fuelling the latter stages of nitrication
conversion process. It also assists in the breakdown of any small particles passing through
from the mechanical stage. Therefore, the K1 media maintains both a young biolm & a
maturing bio lm providing a more consistent lter performance, whilst improving water
quality, encouraging healthier Koi and aiding in reducing green water and blanket weed.
Due to chaotic movement of K1 media, the process is self-cleaning and requires no
maintenance. This allows the lter to reach optimum effectiveness without the disturbance
of periodic maintenance, avoiding unnecessary loss of bacteria within the lter preventing
high levels of ammonia and nitrite within the water. The other major benet of K1 media is
the huge ‘active’ surface area available for the bacteria to grow on compared to other
types of media. This feature allows for smaller lter design, e.g. the Nexus, whilst providing
increased biological efciency.
Fig 7.1
Fig 7.2
Fig 7.3
K1 MOVING BED MEDIA
New media
Low loading mature Heavy loading mature