Deionised (DI) water has had the minerals and impurities removed, bringing it down to 0 TDS. With no minerals left behind as the water dries, you get a spotless, streak-free finish, no drying needed at all.

Water passes through a mixed-bed ion-exchange resin inside the vessel, which strips out minerals and contaminants as it flows. It connects straight to a garden tap or pressure washer. No plumbing, electricity or special tools required, so you're up and running in minutes.

It comes down to how much spot-free water you need before the resin requires replacing, and how portable the unit needs to be. The 5L suits portable, on-the-go use; the 10L (our best seller) suits most detailers and regular home use; the 15L is built for small shops; and the 25L/50L suit high-volume commercial or fleet work. Use our Resin Lifespan Calculator with your local water reading for a personalised estimate.

The simplest way is to test your output water with a TDS meter — once the reading climbs above 0, the resin is spent and it's time for a refill. We recommend keeping a TDS meter on hand so you can check in seconds before every job.

No, the vessel itself lasts indefinitely, after the resin is exhausted all you have to do is order a resin refill kit for a fraction of the original price.

Yes. The systems are designed for tool-free setup and maintenance, with no plumbing experience needed, and refill kits come ready to use.

We ship from our Sydney, Australia warehouse, with free shipping Australia-wide. Delivery times vary by location but the general time frame is 2-8 business days.

Every Spotless DI Water System comes with a 1-year warranty covering defects in workmanship. Please report any manufacturer fault within 7 days of delivery so we can arrange a repair or replacement.

Yes. We offer a 14-day money-back guarantee, provided the system is returned brand new and undamaged. For change-of-mind returns, any non-refundable third-party costs, such as shipping and card processing fees, will be deducted from your refund.

Absolutely. Spotless Water systems are ideal for detailing, ceramic coatings and PPF, giving you a spotless final rinse without leaving mineral deposits or water marks behind.

Absolutely, 0 TDS water is one of the most effective ways to clean solar panels without leaving mineral deposits that can reduce panel efficiency over time.

Yes, our systems are used for marine detailing and vessel wash-downs, giving a spot-free finish on gel coat, glass and metal fittings without the mineral staining regular tap water leaves behind.

Both — the 5L and 10L units are popular with home users after professional, spot-free results on their own car, windows or outdoor glass, while larger sizes suit professional detailers and shops with higher-volume needs.