Summarise this article with:
Pure water window cleaning has revolutionised how we achieve spotless, streak-free windows. We connect you with the knowledge you need to understand these systems, from deionised water filters to reverse osmosis kits. Whether you’re a professional cleaner or tackling your own windows, we’ll guide you through the best solutions available in 2025.
What water do window cleaners use?
Professional window cleaners have moved away from ordinary tap water for good reason. Deionised water is the gold standard – it’s filtered through a purification system to remove all minerals that cause streaks and spots.
Most pros use water with a TDS reading of 0-7 parts per million. Hard water areas like London require more intensive filtration, whilst softer regions can sometimes work with basic filtered water.
Top Tip: Check your local water hardness before investing in equipment – areas with naturally soft water may only need basic filtration systems. You can also see our article on window cleaning equipment.
| Water Type | TDS Level | Best For |
|---|---|---|
| Deionised | 0-7 ppm | Professional results |
| Filtered | 8-50 ppm | Light domestic use |
| Tap water | 100+ ppm | Indoor cleaning only |
The window cleaning industry has embraced this technology because pure water naturally attracts dirt and dries completely clear without any wiping needed.
Pure water systems: deionised vs reverse osmosis
Reverse osmosis filtration systems
RO systems work by forcing water through a semi-permeable membrane under pressure, removing up to 99% of dissolved minerals and contaminants. The process involves multiple stages: sediment filtration, carbon block treatment, then the reverse osmosis membrane itself.
Pro Tip: Most RO systems require a TDS meter to monitor efficiency – your rejection rate should sit between 97-99% for optimal performance.
These systems excel in hard water areas where mineral content exceeds 300 ppm. The purified water produces a completely spot-free finish without any wiping required. Many window cleaning people choose RO because it handles high-volume cleaning whilst maintaining consistent water quality across different locations.
- Initial setup costs range from £300-£1,500 depending on capacity
- Membrane replacement needed every 2-3 years
- Produces 400-1,500 litres per day depending on system size
Deionised resin filter systems
DI vessels contain ion exchange resin that swaps mineral ions for pure hydrogen and hydroxyl molecules. Perfect for soft water areas with TDS levels below 150 ppm, these systems offer simpler setup compared to reverse osmosis.
Top Tip: In soft water regions, a single DI vessel can produce over 2,000 litres of pure water before requiring resin replacement.
| DI System Benefits | Details |
|---|---|
| No waste water | 100% efficiency unlike RO systems |
| Instant results | Pure water on demand |
| Lower maintenance | Simple resin replacement only |
The resin gradually becomes saturated with captured minerals. You’ll know replacement time when your TDS meter reads above 7 ppm output. Many window cleaners prefer DI-only setups for their reliability and straightforward operation.
Water fed pole systems & equipment
Professional trolley systems & pumps
Mobility transforms your window cleaning operation. Portable trolley systems eliminate the need for trailing hoses across properties, giving you freedom to tackle awkward locations and multi-storey buildings without van access.
Pro Tip: Look for trolleys with 100psi pumps – they’ll handle poles up to 80 feet whilst maintaining consistent water flow throughout your cleaning session.
Most professional units feature 25-50 litre capacity tanks with built-in 12v pump systems. The Shurflo pumps remain industry favourites for their reliability, whilst digital flow controllers help conserve water and extend battery life during longer jobs.
- Battery life: 8-12 hours continuous use
- Pump pressure: 100psi standard across leading brands
- Tank capacity: 25L covers average house, 45L for commercial work
- Mobility: Puncture-proof wheels handle steps and rough terrain
Home kit solutions for DIY cleaning
Homeowners can now access professional-grade pure water cleaning without the commercial price tag. Complete starter kits typically include an 18ft telescopic pole, brush head, and portable purification system for around £200-£400.
Top Tip: Choose kits with built-in TDS meters – they’ll help you monitor water quality and know exactly when filters need replacing.
| Kit Component | Home Use Benefit |
|---|---|
| Telescopic poles | Reach second-storey windows safely |
| Portable filters | No permanent installation required |
| Battery pumps | Clean anywhere without mains power |
Most DIY pure water systems connect directly to your garden tap, making weekend cleaning sessions effortless whilst delivering streak-free results every time.
How much does pure water equipment cost?
Budget expectations vary dramatically depending on whether you’re starting a business or cleaning your own windows. Entry-level home kits start from £150-£300, whilst professional setups range from £800-£3,500 for complete van-mounted systems.
Pro Tip: Factor in running costs – replacement resin costs £25-£40 per vessel, typically lasting 2-4 weeks for busy window cleaners.
| Equipment Type | Price Range | Best For |
|---|---|---|
| DIY starter kits | £150-£400 | Homeowners, small jobs |
| Professional trolleys | £800-£1,800 | Mobile window cleaning |
| Van-mounted systems | £2,000-£3,500 | Professional window cleaners |
Remember that quality equipment pays dividends through reliability and reduced maintenance costs over time.
Where can I buy pure water systems in the UK?
Specialist window cleaning suppliers dominate the UK market, offering everything from starter kits to commercial installations. Windowclean Centre and Window Cleaning Warehouse stock comprehensive ranges, whilst Pure2O and Xline Systems focus on professional van-mounted solutions.
Top Tip: Visit trade counters in person – suppliers like Cleaning Spot in South Wimbledon offer custom installations and expert advice you won’t get online.
| Supplier Type | Best For | Key Advantage |
|---|---|---|
| Online specialists | Research and comparison | Competitive pricing |
| Trade counters | Professional advice | Hands-on demonstrations |
| Local dealers | Ongoing support | Quick parts supply |
eBay and general retailers stock budget options, though specialist suppliers provide better technical support and warranties. Many offer finance packages for larger systems, making professional equipment accessible to new cleaning businesses.
