BWT Diamond 25 Mineraliser - Salt & Mineral Chlorinator 25g/hr
BWT Diamond 25 Mineraliser - Salt & Mineral Chlorinator 25g/hr is temporarily out of stock and will ship as soon as it's available.
Don't Guess - Ask Us!
Don't Guess - Ask Us!
Not sure if it’s the right part? Send us a message and a photo of what you’re replacing, or what you need, and we’ll help make sure you get the right part the first time.
Delivery and Shipping Info*
Delivery and Shipping Info*
Free Shipping over $99 for most products. Choose Express Post for fastest shipping!
BWT Diamond 25 Mineraliser - Salt & Mineral Chlorinator 25g/hr
BWT Diamond 25 Mineraliser - Salt & Mineral Chlorinator 25g/hr is temporarily out of stock and will ship as soon as it's available.
BWT Diamond 25 Mineraliser - Salt & Mineral Chlorinator 25g/hr
Pool automation and sanitisation in one premium, connected system. Designed and built in Australia for Australian pools.
- We keep these physically in stock, unlike most drop-shipping websites.
The BWT Diamond 25 Mineraliser is more than a saltwater chlorinator. It combines salt and mineral chlorination, integrated pool and spa automation, a high-brightness touchscreen and smartphone control in a single IP45-rated control box.
The Diamond 25 produces 25 g/hr of chlorine and suits salt and mineral pools up to 50,000 litres in hot climates. It integrates with spas, pool heating, variable speed pumps, lighting and automated valves. Add the Diamond Dose for pH and ORP control, and the Diamond Hub to expand equipment and valve control.
Key Features
- High-brightness touch LCD screen with an intuitive interface and simple menu navigation
- Hinged screen cover on the enclosure protects the display from heat and the elements
- Integrated pool and spa automation built into the main control box - no separate controller needed
- Smartphone monitoring and control via the BWT Diamond Mineraliser app over Wi-Fi
- Self-cleaning 12,000-hour long life cell for reliable, consistent chlorine production
- Superchlorinate mode - runs 100% output for 24 hours to recover water quality
- Pool and Spa modes with two dedicated spa valve actuator outputs
- Salt level alert, water flow indicator and water temperature display
- Favourites - up to 20 saved equipment presets (spa, lights, water features, night swim)
- 8 programmable timers, each with multiple time periods and its own equipment allocation
- Automatic power reduction when salt or mineral level is too high
- Run-dry pump protection and super capacitor timer backup
- Wi-Fi and Ethernet connectivity, with over-the-air software updates
Model Output & Recommended Pool Size
| Model | Product Code | Chlorine Output | Max Pool Size (hot climates) |
|---|---|---|---|
| Diamond 25 | BWTMIN25 | 25 g/hr | 50,000 L |
The Diamond Mineraliser range runs from 15 g/hr to 100 g/hr. See the full Diamond Mineraliser range to compare models.
Specifications
- Chlorine output: 25 g/hr
- Salt concentration range: 3,500 - 7,000 ppm (sodium chloride)
- Ideal salt level: 4,000 ppm
- Mineral / magnesium blend: 3,500 - 4,000 ppm, target 3,500 ppm
- Cell life: 12,000 hours, 5 year warranty on Mineraliser and cell
- Protection rating: IP45 on control box
- Power supply: 240V AC, RCD protected (max 30 mA)
- Single speed pump outlet: 8.5 A max (approx. 2 HP)
- Mounting: stainless steel bracket, min 1 m above ground, min 3.5 m from pool edge
- Cell location: control unit must be within 1.5 m of the cell housing
Connections & Outlets
The Diamond Mineraliser control box provides the following connections:
- Mains power input (240V)
- Single speed pump outlet
- LAN Ethernet port and Wi-Fi antenna
- Output relays (x2 banks)
- RS485 variable speed pump control
- Spa valve actuator outputs (x2, dedicated to Spa Mode)
- Diamond Dose connection
- Diamond Hub connection
- Suction temperature sensor
- Flow switch input
- Chlorinator cell data and cell power
Supported Variable Speed Pumps
The Diamond Mineraliser can directly control the following variable speed pumps, in addition to any standard single speed pump:
- Pentair EnviroMax 1500 - relay controlled, speeds 1/2/3 set on the pump
- Pentair IntelliFlo VSF - RS485 controlled, RPM set from the Mineraliser screen
- Hayward TriStar - RS485 controlled, RPM set from the Mineraliser screen
Expand the System
- Diamond Hub - adds 3 outlets, 4 relays and 3 valve actuator outputs. Connect up to 3 Hubs for 9 ancillaries and 9 automated valves.
- Diamond Dose - automatic acid dosing for pH control, in timed mode or auto mode with a pH probe.
- pH and ORP Sensors - add automatic pH dosing and automatic ORP-based sanitiser output control.
What's in the Kit
- Diamond 25 Mineraliser control unit
- 25 g/hr electrolysis cell
- Cell housing and fittings - clear housing, barrel unions, O-rings and pipe reducers
- Stainless steel mounting bracket and screw kit
Note: This product must be installed and serviced by a qualified pool equipment technician or licensed professional. We carry more spare parts than anyone.
Manufacturer Brochures, Manuals & Part Numbers
Need specifications, part numbers, wiring diagrams or more product information? See the manufacturer documents: Diamond Mineraliser Brochure | Full User Manual | Quick Start Guide
To the layperson, plumbing sizes and their names can be confusing due to the nominal sizes and naming conventions used.
This is not something we made up. Plumbers and manufacturers have used nominal (meaning ‘by name only’) sizing for decades.
Simply put, in plumbing, named sizes are often not the actual measurements of the pipe, fitting, or part. A PVC pipe called “50mm” or “2"” does not measure 50 mm anywhere. Instead, it follows nominal sizing, an internationally-standardised naming system.
Almost all fittings we use in the pool & spa industry use “pressure PVC” pipe & fittings. Do not confuse with “DWV” or other pipe & fittings and their names and sizes.
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) |
|---|---|---|
| 1/2" | 15mm | ~21.2–21.5 mm |
| 3/4" | 20mm | ~26.6–26.9 mm |
| 1" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.8 mm |
| 2.5" | 65 mm | ~75.2–75.5 mm |
To reiterate, these are nominal sizes and are designed to fit matching fittings — not to measure what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions1.
- 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.
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 and other plumbing areas 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).
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 |
Payment & Security
We accept: Visa, Mastercard, Amex, Apple Pay, Google Pay, ShopPay, Paypal, Zip, Afterpay
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
BWTMIN25
