Delivery by the end of October
Available to pre-order now. Delivery by the end of October.
Filter canal, river, lake or rainwater for everyday domestic use and remineralised water for drinking and cooking at a separate tap. StageOne fills your tank; StageTwo polishes the water after your onboard pump or accumulator.
Use the RO tap for drinking and cooking: filling the kettle, cooking pasta or rice, making soup and preparing food.
Boiling is not enough. It kills germs but does not remove heavy metals or nitrates. Reverse osmosis can reduce these and other dissolved contaminants that boiling leaves behind. The reduction achieved depends on the contaminant, membrane, water conditions and maintenance.
LED UV-C is designed to inactivate bacteria, viruses and other microorganisms as water passes through.
Installation: An auxiliary priming pump is required if StageOne is installed more than 1 metre above the waterline. Freshwater only.
Warranty: 2 years. If something breaks, let us know. We’ll send a replacement part where needed and get it resolved as quickly as possible.
| StageOne V3.1 | Integrated brushless pump, six 10-inch cartridges and LED UV-C. Hoses, clips, primary strainer, filters and fittings included. |
|---|---|
| StageTwo | Post-tank filtration for use after your onboard pump or accumulator. |
| Additional UV-C LED module | Flow-activated treatment after StageTwo, before FinalStage RO. 12V DC connection and mains adapter supplied. |
| FinalStage RO | Reverse osmosis with remineralisation and a dedicated drinking-water tap. Both 12V DC and mains power options included. |
Read the individual StageOne V3.1, StageTwo, UV-C LED module and FinalStage RO listings for more detail.
StageOne’s seven-stage process treats source water before tank storage. StageTwo then uses ultrafiltration or ceramic and carbon filtration to further reduce remaining contaminants, tastes and odours. Filter configuration depends on your water source.
FinalStage RO adds reverse osmosis for drinking and cooking. Reverse osmosis can reduce dissolved contaminants, including nitrates, fluoride and metals such as lead; performance depends on the membrane and water conditions. An alkaline post-filter remineralises the water for a clean, fresh taste; a separate remineralisation cartridge is not needed.
The additional UV-C module operates after StageTwo to add post-tank treatment before FinalStage RO. It switches on only when water flows, reducing power use and extending LED lifespan. It supports 12V or 24V DC, and includes a mains adapter. It can use a suitable pump power supply.
| Source water | Canal, river, lake, rainwater |
|---|---|
| Frame | Powder-coated stainless steel |
| Power | 160W; both 12V DC and 230V mains power options included |
| Dimensions | W56.5cm × D32cm × H36.5cm |
| Weight | 14kg (dry) / 19kg (wet) |
| Weatherproofing | Rain and cold resistant (protect from frost) |
| Flow rate | 10–12 L/min (depending on setup) |
| Pump | 50psi brushless motor, overheat protection with bypass valve |
| Filters | 6 × 10" × 2.5" cartridges (varies by configuration) |
| LED UV-C | 101.5mJ/cm² |
| Included | Hoses, clips, primary strainer, filters and fittings |
| Warranty | 2 years |
| Version | V3.1 features a powder-coated stainless steel frame, a brushless pump, additional protection and upgraded plumbing over previous versions. Auxiliary priming pump required for installations more than 1 metre above the waterline. |
| Source water | StageOne-purified water, stagnant tank water, or mains |
|---|---|
| Power use | 0W (passive filtration) |
| Dimensions | W35cm × D15cm × H35cm |
| Weight | 4kg (dry) / 7kg (wet) |
| Flow rate | Up to 16 L/min |
| Warranty | 2 years |
| Suitable source water | pre-filtered, stored tank, rainwater, mains-fed |
|---|---|
| Power | 24W, flow-activated |
| Power supply | 12V / 24V DC; 12V DC connection and mains adapter supplied |
| Dimensions | approx. 30cm length x width 30mm (excl. connectors) |
| Connections | 1/2" BSP female with 12mm hose barb options |
| Maximum pressure | 0.1–0.4 MPa (approx. 15–60 psi) |
| Sterilisation | UV-C LED, 260–280nm |
| UV dose | 101.5 mJ/cm² |
| Maximum effective flow rate | 15 litres per minute (perfect for boats) |
| Expected lifespan | up to 8 years - never change bulb |
| Safety | Status light (green/red) to show bulb activity |
| Warranty | 2 years |
| Source water | Water purified by StageOne + StageTwo, stagnant tank water or mains |
|---|---|
| Power | 75W operating / 1.4W standby; both 12V DC and 230V mains power options included |
| Dimensions | W14cm × D45cm × H40cm |
| Weight | 10kg |
| Flow rate | 1.6 L/min |
| Warranty | 2 years |
StageOne is designed for tank filling. StageTwo is installed after your onboard pump or accumulator; FinalStage RO, where included, is fed from the filtered-water supply.
An auxiliary priming pump is required where StageOne is installed more than 1 metre above the waterline. Keep StageOne protected from frost. It does not filter saltwater or brackish water.
Please note that StageTwo can reduce standard water flow because conventional cartridges create resistance. A 25psi pump may not be enough; we recommend at least 35psi (approximately 2.4 bar). If you use the high-flow UDPAC Argonide NanoCeram filter, this flow-restriction issue is eliminated and the 35psi recommendation does not apply.
Install FinalStage RO indoors. The included drinking-water tap requires a 23mm hole.
Configured specifically for heavy-use boaters (narrowboats, widebeams, river cruisers). Includes filters optimised for high-sediment canal and river water.
Designed for overlanders and mobile users requiring more flexibility in filter choice and water sources. There is the option to get an additional booster pump that helps prime and improve flow (for use if you're parked up several metres from a water source, for instance)
StageOne V3.1 has a compact powder-coated stainless steel frame, 5cm lower and 5cm shorter, with a new brushless pump, additional protection, upgraded plumbing and more robust components.
| Filter life | approx. 1,500–2,000 litres, depending on source-water quality and use |
|---|---|
| Running costs | £50–£90 per year (depending on source water) |
| Filter life | 4–8 months |
|---|---|
| Running costs | £30–£40 per year |
| Filter life | 12–24 months |
|---|---|
| Running costs | £70–£90 per year |
The UV-C LED treatment stage is specified to deliver a UV dose of 101.5 mJ/cm² at rated flow and is designed to inactivate bacteria, viruses and other microorganisms as water passes through the system. The UV-C hardware is supported by supplier technical and compliance documentation, with certificates available on request.
The FinalStage RO uses drinking-water treatment components from manufacturers with products certified to NSF/ANSI 42 and 58. Certification applies to the relevant listed components, not the complete Offgrid Water system.
Warranty: 2 years.
If something breaks, let us know. We'll help identify the issue, send you a replacement part where needed and get it resolved as quickly as possible.
At Offgrid Water, we want every customer to have a working system. Happy customers are the best recommendation we can hope for.
Inside the system
Hover over a numbered point or select a feature. On a phone, tap to explore.
Hover, tap or use the feature buttons. Where labelled, concealed components are marked on their casing; they are not exposed in this view.
StageOne
StageOne V3.1
StageOne provides the source-water filtration, integrated pump and LED UV-C treatment before tank storage.
For canal, river, lake or rainwater. Protect from frost and use an auxiliary priming pump above 1 metre from the waterline.
StageTwo
StageTwo
Install StageTwo after your onboard pump or accumulator. Its three cartridges polish the stored water.
Your existing tank, onboard pump and accumulator are separate from these supplied components.
FinalStage RO
FinalStage RO included
The RO unit is fed from the filtered-water supply and provides approximately 1.6 L/min.
Indoor installation. Allow space for plumbing, filter changes and the dedicated tap.
Extra UV-C
Separate UV-C module included
The separate flow-activated UV-C module adds treatment after StageTwo, before FinalStage RO.
StageOne also contains integrated LED UV-C. These are two distinct treatment positions.
Water route
Source → tank → outlets
StageOne fills the tank; StageTwo sits on the pressurised outlet side. Add or use FinalStage RO for a dedicated drinking-water tap.
The source, tank condition, installation and maintenance all affect the final water quality.
