De-ionizing (DI) water systems remove dissolved minerals that cause spotting when water dries on your RV's exterior. Unlike water softeners that exchange minerals for sodium, DI systems strip all dissolved solids from the water, leaving pure H2O that evaporates without leaving any residue. This makes exterior washing easier and produces spot-free results without hand-drying.

What to Know Before You Buy

• DI systems use replaceable resin cartridges that are exhausted based on how many minerals they remove from your water.
• Very hard water depletes DI resin faster; consider pre-treating with a water softener to extend cartridge life.
• DI water is primarily for final rinses; using it for the entire wash wastes expensive resin capacity.
• Inline TDS (total dissolved solids) meters indicate when resin is depleted and needs replacement.

Trying to achieve spot-free washing results? Contact us about combining softening and DI systems for best results.

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