So RHG makes a really good all-in-one bleach system with 1/2" line and awesome built in tank/pump/reel. It’s about $5,300CDN, though. I mention it only because that looks like the pump they have on the rig, and they definitely do make SH safe pumps.
I’m using a Delavan pump. I get 100psi, 7 or 8 GPM, and it’s spec’d for 3/8" hose which does me fine for house washing. I’ve hooked it up to a cheap 35 gallon pvc tank that fits nicely in my truck. I run it all off a DEEP CYCLE (whatever you get, make sure it’s deep cycle) 12V battery. I have about 150’ of 3/8" hose to reach most any rooftop scenario.
I’ve also built it so that in cases where I have a big strata complex to work on, I can roll the tank and pump rig out of my van and up/down the strip of units to tackle huge projects. Refilling and mixing as I go.
The Delavan pump is about $350CDN and the tank was $125CDN. The hose you want is braided pvc, which is just clear PVC hose that has a fabric braid weave through it for higher pressures. Super cheap stuff.
I hope this helps.