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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 6.3 & 10.3 · 3" Super Hi-Flow multiport · for the all-3" system
When you want to move a lot of water for very little energy
Take the 6.0 or 10.0 tank, fit GC Tek's 3" Hi-Flow multiport and 3" unions, and friction loss drops hard. That lets a 3" Artesian Pro pump turn a 20,000–30,000 gallon pond at low RPM. Pair it with the AquaSieve 3.3 SS prefilter and a 3" NishikigoiUV and you have GC Tek's MegaSystem3 in pieces.
3" everything
3" multiport, 3" unions, clear lid. Built for 3" plumbing runs where 2" would cost you head.
Same tank, more rating
The 10.3 is rated to 30,000 gal and 500 lb of koi at up to 180 gpm — the 3" valve is what unlocks it.
Your media choice
AlphaBioONE (AlphaONE), BioGems (AquaBead) or AlphaNANO — same price either way.
Full GC Tek kit
Omnifuser, 2 HP agitator, ALISS valve, EZ Drain, limited lifetime tank warranty.
| Model | Media | Pond up to | Fish load | Tank | Price |
|---|---|---|---|---|---|
| 6.3 (6 cu ft) | AO / AB / AN | 20,000 gal | 300 lb | 30.4" x 40" | $4,099.95 |
| 10.3 (10 cu ft) | AO / AB / AN | 30,000 gal | 500 lb | 36.4" x 45" | $5,264.95 |
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.