How to Build a Radial Flow Solids Filter for Aquaponic Systems

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After a false start the other week I finally have a new Radial Flow Filter with 50mm/2″ piping installed into the aquaponics system.. The larger pipe has helped with the flow rates & I have no more air lock problems with the fish tank SLO (solids lifting outlet)..

The whole purpose of the filter is to slow the velocity of the water so the solids can precipitate out and be removed from the system.. For this to happen the water must slow its flow long enough inside the filter for the solids to settle out, this is called the retention time.. I have read in a few places that anything over 45 second retention time is acceptable for larger solids, with 2 min being the desirable amount of time for filters like ours..

The formula I use to see how long the water is retained in the filter before moving on is:
Size of filter (in litres) / flow rate (in litres per hour) = Retention time in hours.
(Same can be done in gallons & gallons per hour)
For our system the equation looks like this..
50 / 2700 = 0.0185
Multiply 0.0185 x 60 to turn that into minutes & we get 1minute 11seconds.

Hope that info helps some out there interested in setting up a solids capturing RFF..

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