The functional parts of a Re-circulation Aquaculture Systems ( RAS ) include a :

(1) Growing tank,
(2) Sump of particulate removal device,
(3) Biofilter,
(4) Oxygen injection with U-tube aeration and,
(5) Water circulation pump.

Depending on the water temperature and fish species selected, a water heating system may be necessary. Ozone and ultraviolet sterilization also may be advantageous to reduce organic and bacteria loads.

“After all, you are building a living eco-system that encourage microscopic bacteria to do a majority share of the work.”