Dirty Water Collection Chamber and Just-In-Case Filter...
The airlift manifolds pump the dirty water from the pond into a container that is so great it has two names . The first name is the Dirty Water Collection Chamber (DWCC) which is simply an empty container that connects multiple supply lines (Letter A) into vessel that transports the dirty water into the RDF (Letter B). It would be much too difficult to try and connect four 3" airlift riser tubes into a manifold that would vent the air and connect three 4" inlets of the RDF. The DWCC is also a great way to pre-filter the extremely large debris out of the water before it goes into the micron-screened drum. This 1" x 1" divider (Letter C) allows all the small particles to pass right through into the RDF while stopping the large debris like small twigs and large leaves.
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Whenever you notice large debris has collected on the divider just remove the divider from the filter remove the large debris and place it back in the DWCC.
The second name that the filter goes by is the Just-In-Case Filter (JIC). The name pretty much says it all. You only use it in the worse case scenarios. If for some awful reason you experience an electrical power surge from a lightning strike, or even worse if your filter pit floods and the electronics get submerged with water then you will have no way of mechanically cleaning the micro-screen drum. This means you either need to stop the water flow or remove the access port on the drum screen and allow unfiltered water to pass freely through the drum. If you choose the second course of action then you have a backup plan due to the JIC Filter.
You simply insert the custom cut Matala Mats into the DWCC and reduce the total water flow so that the mats provide your mechanical filtration. This allows you to sent clean water into your biological filter and still bypass the micro-screen drum. This by no means is meant to be a long term solution because it will require daily maintenance in cleaning the filter pads but it allows you to keep your biological filter alive and provide some circulation through the pond while you make repairs to the filter. Cleaning the pads is extremely simple. Just stop the water flow, shake each pad individually inside the JIC filter then remove it once it is clean. After all pads are cleaned and removed you simply drain the JIC filter through the 3" drain (Letter D).
The DWCC/JIC Filter also allows you to individually flush out the bottom drain/skimmer pipes of any settled debris. To do this you simply stop the flow of water, drain the DWCC and then remove the airlift riser tube's standpipe inside the DWCC to allow a massive surge of water flow through the line and purge any settled debris. Once the line is clear reinsert the standpipe and the water flow stops. This simple procedure saves you lots of money on 4" cleanouts, valves and plumbing lines that would otherwise be needed on each bottom drain/skimmer line.
Rotary Drum Filter...
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There has already been a lot of conversation about the RDF so I will not go into much detail about it but I will simply say it is self cleaning mechanical filter that will remove particles of 40 microns and larger from the water column. The dirty water enter into a 40 micron SS mesh drum where all of the solids are filtered from the water. As the micro-screen gets clogged with waste it gets more difficult for the clean water to pass through the screen which raises the water level inside the drum. This water level is monitored by proximity switches so that once the level gets to a certain height it triggers the filter to clean itself and remove all of the trapped waste from the filter. In the rare occasion that the filter doesn't require cleaning within 1 hr of operation the filter automatically cycles so waste is never left inside the drum for longer than 1 hour. This greatly reduces the amount of dissolved organic carbons (DOCs) that are released into the water which is always a good thing. The mechanically clean water then travel from the RDF into the biological filter.
Recirculating Biological Filter...
Water enters the biological filter through the three 4" inlets (Letter A). The water mixes with the water at the top of the filter and begins to travel down through the static submerged Cermedia filtration media (Letter B). The Cermedia is a man made ceramic block that has thousands of interconnected pores through the media. These pores allows for the water to easily travel through the media utilizing the massive amount of surface area contained inside each block of Cermedia. The surface area of the Cermedia is colonized by nitrifying bacteria biologically filters the water so that it is safe to send back to the pond. After the water travels through the Cermedia it returns back to the pond through the filter outlets (Letter C). Some of the water that has passed through the Cermedia bed is transported back to the top of the bio-filter through the center airlift riser tube (Letter D). This allows for maximum exposure to the nitrifying bacteria to make sure the water is as clean as possible before going back to the pond. The airlift riser tube is just a 4" pipe with an air stone dropped into it to create the water movement. This airlift doesn't have to be very efficient because it is not lifting the water but merely transporting it from the bottom to the top of the filter.
As mentioned in the video the airlift riser tube can also be retro-fitted with a UV clarifier to kill the algae spores that might be in the water. I will get into more detail about this later in this thread.
I am sure you have many questions about this system so please ask away!