Young Mountain

You have asked a very good question. i have heard repeatedly from many that the absolute best pressure and equipment is an electric sprayer. The pressure is constant (30 lbs?) but you get even application as oppposed to the pump up kind where your pressure starts to drop quickly - leading to uneven application.

The real issue from my perspective is how much you will apply. Most well known products dilute 4 - 1 with water and the gallon of concentrate covers 1200 sq. ft. (250 sq. ft per diluted gallon) The reason for the water is so that it helps carry the fluorocarbon down into the fibers. many cleaners i have met over the years raise the same concern you have - too much water.

If there is a concern with water then just make sure you apply it at the rate of 1200 sq. ft per gallon of concentrate. Measuring this is the hard part. Too much product and you have increased cost and a crusty carpet. Tool little product and it will not perform. However you do it make sure that you brush it in.

Hope this helps