Why the DI or RO?

Why is DI or RO required with the WFP?
Is it because there’s no squeegeeing?

Hey, someone once said there’s no such thing as a stupid question.


You could use a WFP without DI or RO, but the windows will most likely end up spotting. The spotting occurs from the dissolved solids in the water. RO or DI, alone or in combination, reduces the dissolved solids in water so you don’t get spotting. This is a very simple explanation.

Its not a stupid question man…kudos for asking. there was a time I didnt know either and thought it was a waste of money and time.

Your post just gave me an idea for a new blog post…thaaaank you;)