GCTek AlphaONE Pond Filters
The GC Tek AlphaONE is a pressurized bead filter that handles mechanical and biological filtration in one tank. It uses AlphaBioONE open-cell media, which has far more surface area for beneficial bacteria than standard beads and keeps flowing without slowing down. GC Tek says about 48 of every 50 filters it ships are AlphaONE. Omnifuser™ internals bring water in at the lowest point and out at the highest, so the whole media bed does the work and heavy solids are pulled from the bottom of the tank and flushed out on backwash.
• Five Versions: Standard, Low Head, X2, X2 Low Head and 3-Inch.
• Sizes for Ponds up to 25,000 Gallons: 1.75 to 10.0 cu ft of media.
• 2 HP Media Agitator: Blows air through the media on backwash so it never clumps.
• ALISS Life Support: Hook an air pump to the multiport valve to keep bacteria alive during a bypass or pump failure.
• Built to Last: Double-layer fiberglass tank rated to 58 psi with a Limited Lifetime Warranty.
Which AlphaONE Pond Bead Filter By GCTEK Do I Need?
GCTEK AlphaONE Pond Filters (Standard)
Side-mount multiport valve. The original AlphaONE, in 1.75, 2.50, 4.25, 6.0 and 10.0 cu ft.
AlphaONE Premium Low Head Pond Bead Filter BY GCTEK
Water bypasses the multiport valve in filter mode and only runs through it to backwash. Lowest restriction, so a smaller, lower-amp pump can do the same job. 1.75 to 10.0 cu ft.
AlphaONE X2 Premium Pond Bead Filter By GCTEK (X2 and X2 Low Head)
Everything doubled inside and out so two energy-efficient pumps can run on one filter, filtering a 20,000–25,000 gal pond on about 5 amps. 6.0 cu ft (30″ tank) or 10.0 cu ft (36″ tank), with Classic (two multiport valves) and LH2 (two Low Head valves) options.
AlphaONE 3-Inch
The 6.0 and 10.0 cu ft filters with 3″ unions for big flows and lower friction loss (models 6.3 and 10.3).
GCTek AlphaONE Premium Low Head Pond Bead Filter Sizing
| Size | Max Pond Size | Max Fish Load | Max Flow | Tank (Diameter × Height) |
| 1.75 cu ft | 2,500 gal | 90 lb | 50 GPM (3,000 GPH) | 19″ × 31″ |
| 2.50 cu ft | 5,000 gal | 125 lb | 70 GPM (4,200 GPH) | 21″ × 34.5″ |
| 4.25 cu ft | 10,000 gal | 225 lb | 90 GPM (5,400 GPH) | 24.5″ × 35.5″ |
| 6.0 cu ft | 17,000 gal | 300 lb | 120 GPM (7,200 GPH) | 30.4″ × 40″ |
| 10.0 cu ft | 25,000 gal | 500 lb | 180 GPM (10,800 GPH) | 36.4″ × 45″ |
Every X2, Low Head and 3-Inch model uses the same media volumes as the matching standard size.
Features on Every GCTek AlphaONE Low Head Pond Bead Filter and Standard
- High-flow multiport valve with 2″ unions on every opening (3″ on 3-Inch models)
- Heavy-duty, rebuildable 2″ spring check valve
- Pressure gauge that reads true tank pressure
- Large cleanable sight glass to see when backwash is done
- 10″ clear lid (8″ on the 1.75) for easy inspection
- EZ Drain lets water out without losing media
Before You Order a GCTek AlphaONE X2 Pond Bead Filter or Standard
- Size the filter to your pond volume and fish load, not just gallons. Heavily stocked koi ponds should size up.
- Low Head models let a smaller, lower-amp pump do the same job.
- Prefer classic beads? See the GC Tek AquaBead, the same tank and prices with BioGems bead media.
- Not sure which version fits your plumbing? Contact us with your pond size, pump and pipe size and we will help you choose.
GCTek AlphaONE Pond Bead Filter Manuals
- 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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