I've always understood NOT to use Tap water in the iron-many years with my last iron coming from my Grandmother using it for 20 years, and me using it for 10 years with Tap water, no Tap water goes in my new Black and Decker I've had now for 10 years I use a funnel also supplied with new iron to fill with only drinking/bottled water I get in the gallon jug, I do not spray from bottle, only from steam of iron, and that is not very often, only after washing fabric, and damp out of dryer.