Help on plumbing a portable softwash system

[Jeff Davis]

As you likely know, a softwash system is a way to wash cars, house siding, and roofs that uses low pressure as opposed to a pressure washer, which uses high pressure.

I'd like to build my own softwash system, and I know roughly what I want, but I'm not sure what plumbing parts to buy, and I may need some suggestions on how to plumb the system properly.

I'm basing what I want off this video HERE (~7 min long—but pertinent parts are 0:15-3:10 & 5:43-6:30). I'd like to mimic the guy's setup from the video, but he doesn't reply to comments in YouTube these days, so I was hoping that you guys might be able to help guide me, since I've spent an embarrassing amount of time trying to figure it out already.

The parts that I plan on buying so far:

Tank: Gempler's 25 Gallon Chemical Tank

Pump: Everflo 5.5 GPM Diaphram-style

Pull Cart: Gorilla Cart (4 cu. Ft)​

Hose: 1/2" Clear Vinyl Tubing​

Does anybody have any idea what plumbing parts that I'll need to plumb this thing together? (valves, fittings, etc.)

Any guidance would be much appreciated.

Thanks,
Jeff