I just started doing house washes and need help with getting a 2% mix for stucco. I have a Simpson Powershot 3300psi 2.5gpm Honda engine. I’m trying to downstream. The unit comes with the downstream tip on the pump. The manuel states it’s a 7gals water/ 1 gal of detergent pull ratio. I’m using 10% bleach from Pool essentials and using a 5gal bucket. What is the ratio I need to be using to get 2% mix for this stucco house wash? Do I need to go up in bleach strength to 12.5? Or is it not possible and need to forget about downstreaming due to the 7:1 pump pull ratio?
Thank you for you input I will be checking this hourly!
That’s what I was afraid of when I was doing the math. Thank you. Do you mind explaining a 12v? Or pointing me in the direction of a thread or YouTube video that’s helpful?
Yep, 10% pulling at 7/1 is only going to get you 1.25%-ish, even at 12.5% you’ll only get a little over 1.5% (which isn’t much of a noticable difference anyway). We wash stucco with a 1% pretty routinely. Just Let it dwell or reapply (unless it’s just black & green everywhere). But @TheWizard is right…12v is easiest method for you. If you retool and get a high-draw injector of some sort, you might sniff something close to 2%
You’re probably closer to 14:1 than 7:1 in reality. Cap off the built-in injector, add a GP High Draw 2-3 gpm injector from PressureTek & go work some jobs for free. Get some good before & after photos while you’re at it & consider it a paycheck every time they make the phone ring in the future.
Search bar will be your best friend.
But…a 12v pump is what we typically refer to an electric powered pump that pulls chems from a tank and shoots that same exact same solution out of a pressurized tip without further dilution. Think a pump up sprayer, but with more volume, distance and a battery to do all the “pumping” for you.
Another example would be one of those 15 gallon tank sprayers you’d put on the back of an ATV. It connects to the battery of the ATV for electrical power.
