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.
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Short answer
Water Quality Oxygen Filtration affects both project cost and project risk, so it belongs in the specification stage rather than the purchasing stage. This page sets out what commercial buyers assess, what typically drives cost and lead time, and which questions to put to suppliers before signing. You can turn any of it into a confidential RFQ in a few minutes.
Before you request quotes
A grow-out project typically needs holding infrastructure (tanks, ponds or cages), water movement (pumps, piping, valves), aeration or oxygenation, water treatment appropriate to the system, feeding equipment, grading and handling gear, monitoring and alarms, and backup power. RAS adds mechanical filtration, biofiltration, degassing, disinfection and tighter process control. Hatchery and processing scopes are specified separately.
Specify the items whose sizing changes everything downstream: design biomass and stocking density, water exchange or recirculation rate, oxygen demand at peak temperature, and installed pumping head. With those four fixed, suppliers can quote aeration, filtration, pumps and power on the same basis. FishMatch calculators produce these figures and attach them to the RFQ.
Yes, and phased procurement is common. The usual sequence is water supply and holding infrastructure, then aeration and treatment, then automation and monitoring, then processing and cold chain. Staging works when interfaces and capacity headroom are defined at the start; otherwise later phases force replacement rather than addition.