A $25 injector will do away with about 90% of your 12 volt/fancy pump issues.
I have one of those on my 8 gallon per minute pressure washer. It works great. I need the soft Wash pumps for 6% and above.
Hold my 
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I just have to know what you’re putting 6% on…much less “and above” 
I mean, we carry a 12v system on every rig, but 90% of it’s use is filing the batch tank, and the rest is for 3-4% on bad concrete or roofs.
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He’ll figure it out eventually. In the meantime, he’s a free lunch to the vendors
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I heard there’s a new downstream injector out that can downstream Steel Reserve & spray Keystone Light all over a house.
Years ago I used 6% to prep fences for stain. It absolutely destroys the wood but makes it prime to stain. In and out, we were fence stainers not wood care experts lol
Mainly Roofs with Northwest Moss. You even seen true Northwest Moss? It’s no joke and often requires shooting hot and using a broom or brush to get results you want. That would be 6% and above.
Here one I did a couple days ago before treatment:
I shoot up to 3% for house washes depending on severity. Soft wash system is used as a back up for my chemical injector.
And for fences I don’t use bleach. It takes the color out of the wood. So does Hydrogen peroxide.
I use sodium metasilicate or sodium hydroxide followed by oxalic acid. Between 5 and 10% depending on a variety factors.
Say what you want…results speak for themselves and I don’t compete with anyone but myself.
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Well I’m on here to learn but I can tell you from my experience if you are from the south or east, there are a variety of factors that are different for us in the northwest.
Moss, organic growth and how houses are built are just a few to start with.
I felt like an idiot for years because many soft washers were talking about problems due to lack of gutters and making comments such as yourself.
That said, You won’t find a house in the northwest without gutters. I’ve never seen one unless it was new construction and they weren’t put on or until I visited Houston Texas and realized most people in the Sun Belt don’t have gutters for a reason.
You can call me a free lunch for vendors, or you can be open to the idea that people come from a variety of different backgrounds with different perspectives and different problems.
Either way I appreciate the input and yes, I will figure it out.
If that pic is your example…that’s some pretty basic light moss. Probably 3% with 2 passes, maybe 4% tops. We have never taken a broom onto a roof, a leaf blower once or twice, but never a broom. We’re trying to make the roof last longer, not tear it up 
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That’s not really an either/or scenario. You are free lunch to vendors. I agree that people have different backgrounds and different problems. None of that is applicable to your scenario though. But, carry on with whatever floats your boat.
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All I know is several local pros in my network that have been doing Moss removal on roofs in the Pacific Northwest since the early 90s, none of them shoot less than 6%.
Some have to come back for a second treatment a week later to finish killing it When a roof is neglected too long.
If 6% and higher works for them then it’s good enough for me. If these guys have been in business since the 90s they must be doing something right.
IDK, I have only been running this for a few years, but I didn’t think softwashing existed that long ago… I’m sure @Innocentbystander say for sure, but he’d sooner give up hunting than wash a roof if I had to guess. All I do know is there is almost zero moss in the example pic you posted that would be a pretty easy clean. I would expect some bad moss in your area, but that definitely isn’t an example. I have a couple of actually bad ones on our resume, but I think we all would have to bow to @Dallsheep on the moss issue in our areas, even at 1 year in business… Moss takes far more patience than it takes SH from our experience. I know guys who insist on spraying 2% SH on vinyl with heavier mildew, but that doesn’t make it the right way to do it. There’s a balance between getting the job done and wasting money on SH.
Do you know for sure or is that what they are telling you? The roof you showed wouldn’t even need a broom and you could do it with 6 percent but might be wasting a fair amount of product and when SH is in higher concentrations the risk with messing up paint gets higher. Ask me how I know 
I would play with those percentages. I live in southeast Alaska where we have precipitation roughly 300 days a year and can put a dent in the mossy growth using 3-4ish percent. I’ll show you a few pics of a roof last year I did with 3 in one pass. The other half of roof isn’t done yet, wanted the contrast for pictures.
Might be worth trying it at 3 and seeing how she does. That would half your SH cost if it works. If it doesn’t, you can spray it again and then you know but I feel confident you will be pleasantly surprised if the roofs look like you showed with just 3 percent.
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The #1 thing to remember with applying SH to any surface is dwell time. Whether you only want it to dwell for a few minutes (vinyl for instance) or you want it to dwell as long as physically possible without drying (cleaning moss from shingles) you must pay attention to how long your chemical is dwelling. I’d bet my entire rig the moss in the picture posted by Spirit would’ve cleaned up beautifully with 3% and a longer dwell time. Don’t rush the reaction, boys. Let the chems do the work for you but no need to waste money.
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Someone on here said that our number one tool that we have available to us that we probably don’t take advantage of is dwell time and I am inclined to believe that myself.
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With enough dwell time you can clean concrete with less than a 1% mix. This is how this really dirty driveway looked after I washed this detached garage. Run-off pooled up is this small spot and it was pretty clean after about 20 minutes. This is only a 0.6% HW mix.
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I always try to up sell the housewash to include the driveway, but if the customer doesn’t take the package, I let them know that they will see cleaner areas on the concrete in front of garages and possibly even some streaks down the driveway where the cleaning solution is running towards.
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Dwell time doesn’t require any patience at all if you stay busy. Soap up something else & come back to it instead of standing there watching it. These are all downstreamed…
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All the talk about dwell time is dead on…for us “longer dwell time” is the time from application until the solution goes inert, bc we leave it on the roof to do the best job that it can, for as long as it can do it. If there’s even a hint of rain within 24 hours we postpone (excepting the occasional pop up summer deluge, which dilutes enough to be OK anyhow).
Spray it, make sure it isn’t dripping solution down the downspouts, collect the check and follow up in a few weeks…
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