NishikigoiRDF Rotary Drum Filter in Polypropylene or Stainless Steel
The GCTek NishikigoiRDF Drum Filter is GC Tek's new 2026 line of rotary drum filters for koi ponds, built in polypropylene or stainless steel for ponds from 2,500 to 100,000 gallons. A rotary drum screens solids out of the water before they reach the rest of your filtration. GC Tek built the line to cover every size of pond without cutting corners.
• Two Materials: Polypropylene (PP) or stainless steel (SS) in the same sizes.
• Ten Sizes: RDF 5 to RDF 200, from 1,350 to 53,000 GPH.
• Ponds to 100,000 Gallons: RDF 5 starts at 2,500 gallons; RDF 200 handles 100,000.
• Multiple Inlets: 2 to 4 inlet/outlet ports depending on size.
• Special Order Sizes: RDF 100, 125, 150 and 200 are made to order.
Polypropylene Drum Filter or NishikigoiRDF Stainless Drum Filter?
NishikigoiRDF Polypropylene (PP)
The value choice. Ten sizes from RDF 5 to RDF 200, including the RDF 125.
NishikigoiRDF Stainless Steel (SS)
Same flows and footprints in a stainless steel body. Nine sizes from RDF 5 to RDF 200 (no RDF 125).
GCTek Drum Filter Sizing
| Size | Flow (GPH) | Max Pond Size (gal) | Inlets/Outlets | L × T × W | Material |
| RDF 5 | 1,350 | 2,500 | 2 × 1.5″ | 20.5″ × 20″ × 17″ | PP or SS |
| RDF 10 | 2,650 | 5,500 | 2 × 2″ | 22″ × 20″ × 17″ | PP or SS |
| RDF 20 | 5,300 | 10,500 | 2 × 2.5″ | 27.5″ × 24″ × 21.5″ | PP or SS |
| RDF 30 | 7,950 | 16,000 | 2 × 4″ | 31″ × 28″ × 25″ | PP or SS |
| RDF 60 | 16,000 | 32,000 | 3 × 4″ | 47″ × 38″ × 31″ | PP or SS |
| RDF 80 | 21,200 | 42,000 | 4 × 4″ | 50″ × 41″ × 24″ | PP or SS |
| RDF 100* | 26,500 | 55,000 | Not listed | 54″ × 45″ × 40″ | PP or SS |
| RDF 125* | 33,000 | 65,000 | Not listed | 55″ × 42.5″ × 42″ | PP only |
| RDF 150* | 40,000 | 80,000 | Not listed | 63″ × 51″ × 46″ | PP or SS |
| RDF 200* | 53,000 | 100,000 | Not listed | 70″ × 57″ × 52″ | PP or SS |
* Special order. Specs are the same for PP and SS at each size. Inlet/outlet details for special order sizes are not listed; contact us.
Features of Every Koi Pond Drum Filter in the NishikigoiRDF Line
- Rotary drum screens solids before biological filtration
- Polypropylene or stainless steel body
- Multiple inlets/outlets: 2 on RDF 5 to 30, 3 on RDF 60, 4 on RDF 80
- Ten sizes from 1,350 to 53,000 GPH
- Rated for ponds from 2,500 to 100,000 gallons
- Ready to ship from 6.10.26 (standard sizes)
Before You Order a Rotary Drum Filter for Ponds
- Size by your total flow (GPH) and pond gallons, not gallons alone.
- RDF 100, 125, 150 and 200 are special order; allow extra lead time.
- Check your space: footprints run from 20.5″ × 17″ up to 70″ × 57″.
- Not sure which size fits? Contact us with your pond gallons, fish load and pipe size and we will help you choose.
- FREE Shipping via FEDEX, LTL Ground, & UPS. Ships in 2-3 Business Days.
- Ships Only to Lower 48 States of the United States
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