Hey guys, What hose size should I be using. I purchased a deluxe 7gpm @ 80-100 psi. I've seen some using 1/2 and 5/8" just wondering which works best. Thanks.

I use 1/2 hose. The 5/8 is very heavy and will be dangerous on a roof. Try going to a 5.3 gpm pump and 1/2" ID hose. The flow rate through 300' is about the same.

AC

Also, a 5/8 ID hose is going to be physically larger, and will hold more cleaning solution, thus, it will be heavier to haul around on a ladder, a roof or around a house and if you're working full days, you may appreciate the difference in weight.