Water Spot Calculator
Find out how many spot-free rinses you'll get based on your local water quality
Water spots form when dissolved minerals in tap water are left behind as water evaporates on your car, windows, or solar panels. The higher your water's TDS (Total Dissolved Solids), the worse the spots — and the faster your DI resin gets used up.
Select your city below to see your typical water TDS, how many spot-free rinses you'll get from each tank size, and which system is the best fit for your area.
