I have never used a roller pump so I know nothing about them but I'm thinking that it would be a better option all around for my needs between spraying and watering trees and whatnot. What do you guys think?
I use a roller pump (driven off my PTO shaft) on my 3pt sprayer. I have limited exp with electrical pumps. I am just more of a mechanical guy than an electrical one. I just figured the roller pump would more than likely last longer (I have a tendency to be hard on stuff). It is a bear at times getting it to slip on and off the PTO shaft however - and don't drop it on your toes.
Buy a good tank and pump cleaner. It really helps. Triple Rinsing really helps as well. One of the biggest complaints I get is when guys go from one year to the next and they forgot to clean there tank and pump good. Can cause a lot of problems!
Some chemicals are not compatible with others. I have heard of horror stories of farmers with 500 gallon sprayer tanks of jelly because they forgot to clean there sprayer tanks out from one herbicide spraying to the next! It happens, even in the same chemical family. And it does not take much residue to have it happen.