CRAFTS utilize growbed over fish tank approach, one of most common and easiest approach towards media base Aquaponics. The starting point is a single fish tank of about 100 gallon capacity with 1 or 2 growbed over it.
As you progress first step is to add more growbed to the limit of fish tank to growbed ratio. Shown below 4 growbed to a single 100 gallon fish tank.
Actual running installation below of above theoretical concept.
Additional Fish tank can be install and this is the start of CRAFTS components on your set. Tank can be added one by one progressively with growbed follows to accommodate the extra water volume available.
Above CRAFTS with a Return tank most growbed drain into it and a Feeder tank where water feed pump is located and under certain circumstances can have water return to it.
Feeder tank can use a single pump if capacity is enough or multiple pump as needed to support multiple growbed.
Water in Return tank is always at its maximum level since it has an over flow which ensure this level is maintain. Return tank over flow will send water into the Feeder tank as growbed drains which will then pumped back to the growbed completing the cycle.
More tanks and growbed can be added over time, and each Return Tank with its Growbed set is called a Node. Each Node can be self contain if needed and can form a network similar to a Star topology with Feeder Tank as a centralize Collector-Feeder unit.
This is not much of a problem since a 100 gallon Feeder tank can supply many growbeds. In situation where further expansion is required Return tank can be converted to a Feeder tank with minimal of work to it.
Fish tanks are physically isolated from one another its possible to rear different fish in the tanks and feeder tank can be use to keep Fingerling in safety away from bigger fish.
CRAFT will ensure fish will have at all time constant volume of water and various nodes of Growbed and Tank may house different fishes and feeder tank can contain Fingerlings.
Update : 21 July 2015
After operating CRAFT for more that 2 years, I am very please with the outcome. Water feed and return distribution has no issues.
Fish solids migrate to center (feeder) tank by water movement and so far I only scoop up few solids and pebbles once during the two year of operation.
Water has been very clear and odourless.
A short presentation of CRAFTS
CRAFTS and CHOPS the difference : Here
My 1st CRAFTS Installation : Here