Description
Bring commercial-grade water polishing to your freshwater system with the RK300PE Freshwater Protein Fractionator from RK2 Systems. Purpose-built with a honeycomb-style cone riser assembly designed specifically for freshwater bubble behaviour, this fractionator strips suspended particulates, dissolved organics, proteins, and tints from the water column while boosting dissolved oxygen—performance that’s normally reserved for saltwater systems, now engineered to work in fresh water.
Key Features & Benefits
- Freshwater-Specific Riser Design: A honeycomb-style cone riser assembly overcomes the lower bubble density of freshwater, giving the foam the surface area it needs to stay stable on its way to the collection cup.
- Enhanced Air Injection: Tuned air injection improves protein and dissolved-organic removal while maximising oxygen saturation—critical in freshwater applications where bubble dynamics differ from saltwater.
- Non-Corrosive Construction: Built with 316 stainless steel hardware and non-corrosive materials throughout for long service life in freshwater recirculating systems.
- Battery-Powered Wash-Down Timer: A low-maintenance LCD wash-down timer (120/240V, 50/60Hz) automates rinse cycles, keeping the riser and cone free of dried foam build-up.
Ozone-Ready: Every model in the range is ozone ready, letting the fractionator double as an ozone contact chamber and reduce the equipment footprint if ozone is part of your treatment train. - Counter-Current Flow Design: Water enters at the top of the reaction chamber and travels down through the rising air column, maximising contact time and mass-mixing efficiency versus co-current designs.
- Powerful Performance: Rated for a flow rate of 1098-1230 LPM, with a 2 HP Pump | 230 VAC, 3 PH (4.8A x4) drive motor as standard.
- Sturdy Footprint: With a 121.92 cm diameter and total height of 279.4 cm, the RK300PE Freshwater is sized for serious recirculating aquaculture systems (RAS) while keeping a manageable footprint.
- Dedicated Ozone Connection: A pre-installed ozone gas connection point supports integration with an appropriately sized ozone generator (RK2 recommends the RK8G Air / RK8G Oxygen).
Note: This item is built to order and ships From Manufacturer allow 10 to 14 weeks. Orders after Sept 1st. are subject to extended lead times. Call before ordering.
| Model | Recommended Flow* | High-Flow Option* | Chamber Diameter | Overall Height | Footprint | Dry Weight |
|---|---|---|---|---|---|---|
| RK25PE | 20 GPM / 4.5 m³/h | — | 14″ / 356 mm | 77″ / 1,956 mm | 24″ × 36″ / 610 × 914 mm | 102 lb / 46 kg |
| RK50PE | 40 GPM / 9.1 m³/h | — | 20″ / 508 mm | 99″ / 2,515 mm | 32″ × 44″ / 813 × 1,118 mm | 220 lb / 100 kg |
| RK75PE | 70 GPM / 15.9 m³/h | 105 GPM / 23.9 m³/h | 24″ / 610 mm | 102″ / 2,591 mm | 32″ × 44″ / 813 × 1,118 mm | 235 lb / 107 kg |
| RK150PE | 155 GPM / 35.2 m³/h | 230 GPM / 52.2 m³/h | 36″ / 914 mm | 101″ / 2,565 mm | 41″ × 54″ / 1,041 × 1,372 mm | 365 lb / 166 kg |
| RK300PE | 290 GPM / 65.9 m³/h | 435 GPM / 98.4 m³/h | 48″ / 1,219 mm | 110″ / 2,794 mm | 54″ × 66″ / 1,372 × 1,676 mm | 440 lb / 200 kg |
| RK600PE | 585 GPM / 132.5 m³/h | 890 GPM / 201.8 m³/h | 60″ / 1,524 mm | 144″ / 3,658 mm | 69″ × 78″ / 1,753 × 1,981 mm | 750 lb / 340 kg |
| RK1000PE | 1,100 GPM / 249.8 m³/h | — | 84″ / 2,134 mm | 144″ / 3,658 mm | 92″ × 114″ / 2,337 × 2,896 mm | 900 lb / 408 kg |
| RK2000PE | 1,500 GPM / 340.7 m³/h | — | 84″ / 2,134 mm | 168″ / 4,267 mm | 92″ × 114″ / 2,337 × 2,896 mm | 1,200 lb / 544 kg |
Why Choose the RK300PE Freshwater?
Purpose-Built for Freshwater: Unlike saltwater skimmers adapted after the fact, RK2’s freshwater fractionators are engineered from the ground up around freshwater’s lower bubble density and different foam characteristics.
Reduced Bacterial & Pathogen Load: Fractionation strips dissolved organics before they can feed bacterial and pathogen growth, keeping RAS and grow-out systems cleaner between water changes.
Improved Oxygenation: The process saturates the water with oxygen as it strips waste—supporting higher stocking densities, stronger feed conversion and improved animal health.
Ozone-Compatible Design: With ozone-ready construction throughout, the RK300PE Freshwater can be upgraded into an ozone contact chamber without additional floor space.
Applications:
Ideal for recirculating aquaculture systems (RAS), freshwater grow-out and hatchery operations, research facilities, and any freshwater life-support system carrying a heavy bio-load that needs dissolved-organic and protein removal alongside improved oxygenation.
Technical Specifications — RK300PE Freshwater Protein Fractionator
Parameter Specification
Model RK300PE (Freshwater)
Water Flow Rate 290 GPM / 325 GPM (approx. 1098-1230 LPM)
Reaction Chamber Diameter 121.92 cm
Height (Floor to Top) 279.4 cm
Footprint 121.92 x 167.64 CM
Dry / Ship Weight 294.84 kg
Operational (Wet) Weight (est.) 2399.8 kg
Material — Reaction Chamber Non-corrosive construction, 316 stainless steel hardware
Riser / Cone Honeycomb-style freshwater cone riser assembly
Recommended Ozone Generator RK8G Air / RK8G Oxygen
Rinse System Battery-powered LCD wash-down timer (120/240V, 50/60Hz)
Drive Motor 2 HP Pump | 230 VAC, 3 PH (4.8A x4)
Water Type Freshwater
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