Naked MINI Freshwater Spa Sanitising System
Naked MINI Freshwater Spa Sanitising System - is backordered and will ship as soon as it is back in stock.
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Naked MINI (NKD-M) Freshwater System
for Spas & Swim Spas up to 30,000L
Enjoy crystal clear, soft freshwater in your spa or swim spa without relying on heavy chlorine, salt or mineral systems. The Naked MINI (NKD-M) uses copper and silver ionisation with a built-in oxidiser to provide gentle, effective sanitation that feels like swimming in a natural freshwater stream. This is the same system used in Halo Spas and others.
Key Benefits
- Designed specifically for spas and swim spas from 1,000 litres up to 30,000 litres.
- Uses natural silver and copper as sanitisers.
- Freshwater feel with no harsh chemical smell.
- Ideal for families, asthmatics and anyone with sensitive skin, eczema or psoriasis.
- No salty residue or mineral build-up on covers, jets, heaters or surrounds.
- Helps extend the life of pumps, heaters and spa fittings.
- Lower running costs compared with traditional chlorine, bromine, and salt systems.
- No need to shower or rinse swimwear after use in most situations.
- Optional pH Bundle automatically doses acid as needed to further reduce maintenance.
Why the Naked MINI is Great for Spas & Swim Spas
- Works brilliantly in warm and hot water where chlorine santisers struggle.
- Provides a soft, silky feel to the water rather than dry or sticky skin.
- Reduces chemical odours in enclosed spa rooms and swim spa enclosures.
- Gentle on spa shells, headrests, covers and nearby furniture.
- Great option for customers who dislike traditional chlorine and bromine or cannot tolerate it.
How the Naked MINI Works
The NKD-M uses the same hybrid technology as the larger Naked freshwater systems, scaled for smaller bodies of water:
- Copper and silver ionisation to inhibit algae and purify the water.
- Built-in oxidiser cell that produces a very small amount of oxidiser to remove organic material.
- Digital control unit to manage output for your spa or swim spa volume.
- Optional NKD-pH Controller for semi-automatic pH management and easier water balance.
System Capacity & Compatibility
- Suitable for spas from 1,000L to swim spas up to 30,000L.
- Compatible with most common spa and swim spa surfaces.
- Can often be retrofitted to existing installations. Plumbing and electrical work must be carried out by suitably qualified trades.
What You Get
- Naked MINI (NKD-M) control unit.
- OXI & ION cell for copper and silver ionisation and oxidation.
- Mounting hardware (where supplied by Naked).
- Installation and setup manual.
Installation & Important Notes
- Professional installation is strongly recommended. Plumbing and electrical work must comply with local regulations.
- Existing spa or swim spa equipment (pumps, filters and heaters) must be in good condition and correctly sized.
- Regular water testing is still required to maintain correct pH, alkalinity and sanitiser levels.
- Always follow the manufacturer’s instructions and recommended test kit or digital tester for the Naked system.
- Installation Manual | Download App
Usage Notes
- You still need to test, balance, and maintain your water like any other spa or swim spa.
- Keep (Copper levels 0.4-0.6ppm.
- Keep TDS in the 500-600ppm.
If you have questions about suitability for your spa or swim spa, contact us for advice on sizing, installation and compatible equipment.
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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