DI (Deionization) Pure Water Systems

DI systems are the simplest and most affordable way to produce pure water for waterfed window cleaning. Using ion exchange resin, a DI tank removes the dissolved minerals that cause spotting and streaks — delivering water that reads 0 TDS (total dissolved solids) at the brush. No electricity required, no complicated setup: connect your garden hose, run it through the tank, and you’re producing pure water.

How DI Works

Tap water passes through a tank filled with mixed-bed resin that exchanges calcium, magnesium, and other mineral ions for hydrogen and hydroxyl ions — which combine to form pure water. When the resin is exhausted (TDS creeps back up), it can be recharged or replaced.

Why Choose a DI System?

• Best for low-TDS water — if your tap water is under 200 ppm TDS, DI alone is highly cost-effective
• Affordable entry point — lower upfront cost than RO/DI systems; ideal for operators starting out
• Simple and portable — compact tanks are easy to transport and require no power source
• Immediate results — no membrane warm-up time; produces pure water as soon as water flows through

DI vs. RO/DI

In high-TDS areas (above 200–300 ppm), DI resin exhausts quickly, making running costs higher than an RO/DI system. If your water is hard, consider an RO/DI setup to protect your resin investment.