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GC Tek assembles this unit at the factory after you order — allow roughly 3 weeks before it ships. It travels by LTL freight; no freight is charged at checkout. We quote the freight to your address and confirm it with you before anything ships. Local pickup in Upland, CA is always free.
GC Tek NishikigoiRDF · rotating drum filter · polypropylene or 316 stainless · 2,500 to 100,000 gal
Mechanical filtration that cleans itself — for every size pond imaginable
A rotating drum filter pulls solids out of the water on a 75-micron 316 stainless mesh before they ever reach your biological filter, then rinses the screen automatically the moment the water level drops — no baskets, no backwash, no bead bed to clog. GC Tek's NishikigoiRDF comes in ten sizes and two bodies: heavy-duty polypropylene, or full 316 stainless. Multiple inlets and outlets in oversized pipe, a 40 W drum motor and 120 W wash pump, and the price-to-flow ratio you expect from GC Tek.
75-micron 316 SS screen
Fine enough to strip feed fines and string algae, tough enough for decades.
Automatic backwash
Float switch senses the drop across the screen, the drum rotates and the spray bar rinses it to waste. About 3–4 gallons per cycle.
Gravity or pumped
Plumb it gravity-fed off bottom drains ahead of the pump, or pump-fed. The 30 handles 6,000–8,000 gph gravity / 7,950 gph pumped.
Pairs with AlphaONE
Drum for solids, AlphaONE / AlphaNANO or a Wakimizu shower for biology. This is how GC Tek builds the big ponds now.
Sizes
| Model | Max flow | Pond up to | In / out | Footprint (L × H × W) | Polypropylene | 316 Stainless |
|---|---|---|---|---|---|---|
| RDF 5 | 1,350 gph | 2,500 gal | 2 × 1.5" | 20.5" L × 20" H × 17" W | $995.00 | $2,680.00 |
| RDF 10 | 2,650 gph | 5,500 gal | 2 × 2" | 22" L × 20" H × 17" W | $1,349.95 | $2,974.95 |
| RDF 20 | 5,300 gph | 10,500 gal | 2 × 2.5" | 27.5" L × 24" H × 21.5" W | $2,269.95 | $3,119.95 |
| RDF 30 | 7,950 gph | 16,000 gal | 2 × 4" | 31" L × 28" H × 25" W | $2,995.00 | $5,295.00 |
| RDF 60 | 16,000 gph | 32,000 gal | 3 × 4" | 47" L × 38" H × 31" W | $4,575.00 | $7,495.00 |
| RDF 80 | 21,200 gph | 42,000 gal | 4 × 4" | 50" L × 41" H × 24" W | $5,899.00 | $9,795.00 |
| RDF 100 | 26,500 gph | 55,000 gal | special order | 54" L × 45" H × 40" W | $7,739.95 | $10,995.00 |
| RDF 125 | 33,000 gph | 65,000 gal | special order | 55" L × 42.5" H × 42" W | $8,199.95 | — |
| RDF 150 | 40,000 gph | 80,000 gal | special order | 63" L × 51" H × 46" W | $10,419.95 | $14,680.00 |
| RDF 200 | 53,000 gph | 100,000 gal | special order | 70" L × 57" H × 52" W | $12,369.95 | $18,600.00 |
What comes with it
- Drum, 316 SS mesh, drum motor (40 W) and wash pump (120 W), spray bar, float switch and controller
- Unionized inlets/outlets (2 × 1.5" on the 5, up to 4 × 4" on the 80) and a 2.5" waste line
- Ready for gravity-fed or pump-fed installation; we'll walk you through the plumbing
Ordering & delivery
How long until it ships?
Most GC Tek filters and systems are assembled to order in Chandler, Oklahoma. Typical lead time is about 3 weeks from order to ship, then transit time. Parts and media we stock ship from Upland, CA within a day or two.
Why no freight at checkout?
Freight for a pressure filter or pre-plumbed system depends on your address, liftgate needs and residential vs. commercial delivery. Charging a flat guess would overcharge some customers and undercharge others, so we quote it to the dollar and confirm with you before shipping.
Can I pick it up instead?
Yes — pick up free at Mystic Koi & Water Gardens in Upland, CA. Choose local pickup at checkout or tell us in the order notes and we'll skip freight entirely.
Who handles the warranty?
We do. As an authorized GC Tek dealer we process warranty and parts through the factory for you — no shipping the tank back across the country.
GC Tek
Grand Champion Technologies · Chandler, Oklahoma · pond filtration built in the USA
Mystic Koi & Water Gardens — authorized GC Tek dealer, Upland, California.
Questions on sizing? Call the shop and talk to someone who runs these filters.