Here’s one I rigged up with a small pump for applying sodium percarbonate and oxalic to large decks and fences. I still use a pump up for smaller jobs but it really saves time when I have a large area to do.
If you’re thinking of using a larger gpm pump to do roofs or jobs that will need a large amount of mix I’m with @anon37135677. Just consider the gpm versus tank size or how much time you’ll need to spend refilling it. A portable 12v can work for certain jobs but wouldn’t work well for doing something like roofs where it will take a lot of mix.
