The tanks drain back to a sump where the water is filtered and then pumped to each tank at 15000 litres per hour. About four times a day the pump switches off to allow excess water to drain away, then new water tops it up.
Heat is supplied from a solar hot water system.
The main tanks are 400 litres. Fish are raised in the larger tanks after reaching 4 cm. Smaller breeding tanks are located in the next row.