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Matala GeyserMax-Flow — the low-amp, continuous-duty pump for koi pond filtration
Built for 24/7 duty with a corrosion-resistant composite resin base and a motor that draws noticeably fewer amps than most pumps of its flow — the GM-6200 moves 6,200 GPH on 6.7 A. Five sizes, 1½" or 2" discharge, 19 ft cord, 2-year warranty.
- Flow range
- 3,200–6,200 GPH
- Max head
- 15.7–41 ft
- Amps
- 2.5–6.7 A
- Outlet
- 1½" / 2"
- Warranty
- 2 years
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Mystic Koi’s take
This is our default koi-pond pump: it runs all year, so the amp savings over a GeyserFlow pay back the price difference in a season or two, and the composite base shrugs off salt treatments. Use the picker below — enter your flow and lift — then protect it with a Pump Defender.
What it does
- Low ampsBest watts-per-gallon in the Matala line.
- Continuous dutyDesigned to run 24/7.
- Corrosion resistantComposite resin base.
- Overheat protectionBuilt in.
- Solids3/4" (1/3" with screen).
- 2-year warrantyLongest in the line.
GeyserMax-Flow specifications (per Matala)
| Model | HP | Outlet | Max flow | Max head | Max amps | Weight |
|---|---|---|---|---|---|---|
| GM-3200 | 1/5 | 1½" | 3,200 GPH | 15.7 ft | 2.5 A | 15.4 lb |
| GM-3900 | 1/5 | 1½" | 3,900 GPH | 22.5 ft | 2.5 A | 18 lb |
| GM-4700 | 1/3 | 2" | 4,700 GPH | 27.5 ft | 3.2 A | 18 lb |
| GM-5400 | 1/2 | 2" | 5,400 GPH | 32.8 ft | 5.0 A | 20 lb |
| GM-6200 | 1 | 2" | 6,200 GPH | 41 ft | 6.7 A | 22 lb |
Dimensions 10 × 8 × 17 in. Flow and head figures are the manufacturer’s ratings (Matala Water Technology); real-world flow depends on pipe size, fittings and filter back-pressure.
GM-6200 flow at height (GPH)
| 5 ft | 10 ft | 15 ft | 20 ft | 25 ft | 30 ft | 35 ft |
|---|---|---|---|---|---|---|
| 6,020 | 5,865 | 5,360 | 4,640 | 3,800 | 2,670 | 1,620 |
Pump picker
Enter the flow you need and the vertical lift to the top of your waterfall or filter; the matching model highlights.
Pairs well with
The science: why head height, not just GPH, decides your pump
A pump’s advertised GPH is measured at zero lift. Every foot of vertical rise (static head) and every fitting or length of pipe (friction head) subtracts flow along the pump curve, so a 4,700 GPH pump feeding a waterfall 10 ft above the pond may deliver well under 4,000 GPH. Size from the flow-at-height row that matches your lift, and keep pipe one size larger than the pump outlet to limit friction losses.
- Matala Water Technology Co. (2026). GeyserFlow, GeyserMax-Flow and VersiFlow product data — flow-vs-height tables. matala.com.tw.
- Lekang, O.-I. (2013). Aquaculture Engineering, 2nd ed., ch. 7 (Pumps): head loss and pump curves. Wiley-Blackwell.
Questions we get about the GeyserMax-Flow
Why does GM-3200 and GM-3900 share 1/5 HP?
Different impeller — the 3900 trades a little efficiency for more head. Both draw 2.5 A.
Salt safe?
Yes, the composite base and stainless hardware tolerate the 0.3% salt levels used in koi treatments.
Matala at Mystic Koi
Matala filter media and pond equipment have been a koi-keeping staple for decades, and Mystic Koi has sold and run Matala gear in our own systems since we opened in Upland, California in 1996. Everything on this page ships from Matala USA (Sea Life Designs) or our ¾-acre facility. Not sure what fits your pond? Call or visit and we’ll size it with you.