Gecko Maelstrom CMS-1 Circulation Pump 0.25hp / .12hp - Circmaster Replacement
Gecko Maelstrom CMS-1 Circulation Pump 0.25hp / .12hp - Circmaster Replacement is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
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This new Gecko Maelstrom CMS-1 pump replaces* the now obsolete Aquaflo Circmaster 1/15 spa filtration and circulation pump as of 2024. See notes below!
- Kept Physically in Stock - Unlike Most Online Sellers
- Fast Shipping or Pick-up
With its superior efficiency, the Maelstrom CMS-1 circulates up to 30% more water in the same amount of time, thus reducing the filtration cycle and the energy consumption. WWDG compatible.
When it’s time to kick back and relax, the amazingly low 44 dB generated by the CMS-1 makes it as quiet as a gentle rain.
Gecko went the extra mile to make the CMS-1 the smallest in its category. This pump takes up to 23% less space than our closest competitor’s pump. Plus, it’s easy to use and gives users a variety of positioning options thanks to its simple mounting bracket.
Specifications & Details:
- Includes: Pump, Barrel Union Tail & Nut, 3x drain plugs, ~2.3m lead
- Rotatable wet-end
- 200W input / 0.89A
- 0.12hp Output
- 2.3m Lead
- 56-frame Motor
- 2.53m max head pressure
- 260 LPM max flow
- Overall Width: 163mm
- Overall Height:185mm
- Overall Length: 269mm
- High-temp Capacitor rated to 85°C
- High ambient temperature rated to 60°C
- Max Water Temp: 50°C
- Seal Bearings
- Removable Feet
- Brochure & Flyer
* Important Installation Notes:
When replacing older Circmaster or WWDG pumps with the Maelstrom, please refer to the accompanying images on this listing for guidance. Although the Maelstrom is the closest available replacement, its suction side is recessed by approximately 25 mm compared to the Circmaster pumps. Consequently, some plumbing modifications may be necessary to ensure proper installation.
Replaces older Circmaster pumps (* see notes above) that may have the following details:
- Circmaster Emerson circulation pump 1/15HP, CMCP, CMHP, CMXP, Circ-Master, WWDG Circ pump
- Emerson Motor: 1563 Spa Motor, FMCP, FMHP, Gecko Ref : 06334000-2040, Emerson Motor, k55mygrd-8367, K55MYGRD, K55MYGRD-8367, K55MYKHF-9557, K55MYRPY-2111, 9352-9303, 9352-9306, Part No: 9352-9309, 9352-9304, HP 1/15, RPM 1425, Emerson K55MYKHF-9557
- Spa Industries: APUMC1552A, APUMC1562A,
- Sundance / Jacuzzi Ref: 6500-911, 02410512-2
- Aquaflo: CMHP-550114, 06040000-2, 2093, 02410004-2, 02410004-2 code 07345, 02410004-2 Code 08155, 02410004-2 Code: 05189, 02410004-251, 3J10070-0E, A-02410004-2510, SD6500-911, 00707000-251000707001-2510, 00707002-2510, 00710392-2500, 00710392-2510, 02093001-2, 02093001-2, 02093001-2010, 02093002-2, 02093004-2, 02093006-2, 02093008-2100, 02093008-2110, 02093008-2130, 02093008-2520, 02093466-2, 02093634-2, 02093639-2, 02093649-2, 02093656-2010, 02093656-2110, 02093656-2130, 02093656-2510, 02093658-2, 02093678-2, 02093695-2, 02093700-2110, 02093700-2510, 02093759-2, 02096281-2, 02407001-2510, 02407002-2, 02407002-2510, 02407384-2510, 02407422-2010, 02407422-2510, 02407670-2, 02408492-2, 02408492-2510 02410000-2500, 02410003-2500, 02410004-2510, 02410013-2510, 02410014-2510, 02410377-2510, 02410388-2, 02410392-2110, 02410402-2510, 02410498-2000, 02410498-2100, , 02410662-2110, 02410701-2, 02410701-2510, 02410974-2510, 02410979-2510, 02415001-2010, 02415001-2500, 02415001-2510, 02415002-2010, 02415002-2310, 02415003-2510, 02415004-2510, 02415005-2010, 02415005-2510, 02415006-2510, 02415422-2010, 02415422-2510, 02420000-2510, 02420001-2500, 02420002-2510, 02907422-2510, 02910422-2510, 02910498-2000, 06040000-2300, 6000-907, 9352-9303-A, f02410004-2510, f02410004-2510ampb, 02410004-2, CMHP-550114
- Waterway Iron Might / Waterway Plastics Iron Might
Gecko Maelstrom, Malestrom
In plumbing, named sizes are not the actual measurements. A pipe called “50mm” or “2"” does not measure 50 mm across. Instead, it follows nominal sizing, an internationally-standardised naming system.
Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:
| Imperial Name | Metric Name | Pipe Diameter (OD) |
|---|---|---|
| 1" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.5 mm |
| 2.5" | 65 mm | ~75.2–75.5 mm |
These are nominal sizes and are designed to fit matching fittings — not to measure exactly what their name suggests.
Understanding Plumbing Sizes & Nominal Measurements
Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems so that pipes and fittings remain compatible.
Why pipe sizes don’t match the measurements
The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate. Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.
How to Measure Pipe Correctly
-
Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
- Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
- The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).
PVC Pressure Pipe AS/NZ 1477 Dimensions1:
Common nominal sizes with typical outside diameters and indicative inside diameters by class.
| Imperial Name | Metric Name | Outside Diameter (OD) | Class 9 IDº | Class 12 IDº | Class 18 IDº |
|---|---|---|---|---|---|
| 1/2" | 15 mm | ~21.2–21.5 mm | 18.3 mm | 17.8 mm | |
| 3/4" | 20 mm | ~26.6–26.9 mm | 23.7 mm | 22.4 mm | |
| 1" | 25 mm | ~33.4–33.7 mm | 30.5 mm | 29.8 mm | 28.1 mm |
| 32 mm | ~42.1–42.4 mm | 38.5 mm | 37.5 mm | 35.4 mm | |
| 1.5" | 40 mm | ~48.1–48.4 mm | 45.2 mm | 44.1 mm | 42.8 mm |
| 2" | 50 mm | ~60.2–60.5 mm | 55.2 mm | 53.7 mm | 50.5 mm |
| 65 mm | ~75.2–75.5 mm | 68.9 mm | 67.0 mm | 63.2 mm | |
| 2.5" | ~73 mm |
- º Internal diameters vary slightly by manufacturer and class.
- 1 Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.
Hose & Tube Dimensions
Common flexible hose sizes used in pool/spa systems (approximate IDs).
| Imperial Name | Metric Name | Inside Diameter (ID) |
|---|---|---|
| 3/8" | 9–10 mm | ~9 mm |
| 3/4" | 19 mm | ~19 mm |
BSP – British Standard Pipe Thread Sizes
BSP thread names are also nominal. The thread OD will not equal the nominal name.
| BSP Thread Size Naming | Outside Diameter (mm / inch) | TPI |
|---|---|---|
| 1/16" BSP | 7.7 mm / 0.304" | 28 |
| 1/8" BSP | 9.7 mm / 0.383" | 28 |
| 1/4" BSP | 13.16 mm / 0.518" | 19 |
| 3/8" BSP | 16.66 mm / 0.656" | 19 |
| 1/2" BSP / 15 mm | 20.99 mm / 0.825" | 14 |
| 5/8" BSP | 22.99 mm / 0.902" | 14 |
| 3/4" BSP / 20 mm | 26.44 mm / 1.041" | 14 |
| 7/8" BSP | 30.20 mm / 1.189" | 14 |
| 1" BSP / 25 mm | 33.25 mm / 1.309" | 11 |
| 1-1/4" BSP | 41.91 mm / 1.650" | 11 |
| 1-1/2" BSP / 40 mm | 47.80 mm / 1.882" | 11 |
| 2" BSP / 50 mm | 59.61 mm / 2.347" | 11 |
| 2-1/4" BSP | 65.71 mm / 2.587" | 11 |
| 2-1/2" BSP | 75.18 mm / 2.960" | 11 |
| 3" BSP | 87.88 mm / 3.460" | 11 |
| 4" BSP | 113.03 mm / 4.450" | 11 |
| 5" BSP | 138.43 mm / 5.450" | 11 |
| 6" BSP | 163.83 mm / 6.450" | 11 |
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