just spent 3 days using them with a backpack , love em, definitely used less water and its easy to tell with a backpack and i think they sped me up a bit , your not gonna be home 3hrs early like lol but they are deff better than the red fans ive used for years, i rinse on the glass most windows but those i dont eg conservatories and ones near trees and bushes i rinsed much quicker than normal