Water quality management is the single largest operational determinant of aquaculture productivity — dissolved oxygen (DO), ammonia (TAN), CO₂, pH and TSS control the biology of every stocked tank or pond. Right-sizing the oxygen, filtration and disinfection train is the difference between a bankable KPI and a wipe-out.
Cold-water species need DO ≥ 8 mg/L; warm-water RAS species 5–7 mg/L; shrimp 4–5 mg/L. Design for peak biomass demand plus 30% safety margin and a redundant backup oxygen source with SCADA alarms.
Drum filters dominate above 100 m³/h with 60–90 µm screens. Bead filters win for smaller loops with integrated biofilm. Screen-mesh selection is a trade-off between TSS removal and hydraulic head loss.
Moving-bed biofilters (MBBR) with 500–800 m²/m³ specific surface area are the RAS standard. Size for peak TAN load at design temperature and feed input, then add safety factor for cold start-up.
Packed towers or cascade aerators pull CO₂ from 15+ mg/L down to < 8 mg/L. Alkalinity buffering (sodium bicarbonate) keeps pH stable through the nitrification acid load.
UV kills waterborne pathogens without residue. Ozone oxidises organics and micro-flocs before the biofilter. Most bankable RAS combine both — ozone in the primary loop, UV as a pathogen polishing step.
One RFQ. Multiple project-matched suppliers. Zero cost to buyers.