It’s my neighbor’s roof (free), just a partial section but as you can see it needs cleaning. You guys helped with dialing in the soap and bleach percentages on my proportioner, man that surfactant really sticks!
I soaked the driveway in case overspray hit it, also diluted what little came out of the downspout. We’ll see here in a couple days how it turned out.
Thanks to everyone that helped get my 12v set up!
That will come out beautiful brock 
good idea to play with chemical strengths and techniques on a freebie to get an idea of how it works.
You might want to consider bagging the gutters in the future. That’ll catch all the run-off.
I realize that now, where can I get some? Also I don’t plan on rinsing, what happens when it rains and I’m not there with the bags?
I posted (a long time ago) where I bought my roll of poly. I’ll see if I can find it for you.
Well hmm, maybe it’s still wet from rain we had last night but looks the same.
Guess I’ll have to check the SH draw. I noticed it wasn’t exactly eye watering when I applied it.
What % did you use? Here’s a link to the bags referred to but you can tape any good strength garbage bag to the downspout and it will work well.
I’m trying to get things dialed in, water is straight through (no valve) and SH was at about 4, surfactant straight draw wide open.
I’ll play with it some today, back off on the soap and open the SH full.
Thanks for the advice, the garbage bag idea makes a lot of sense as I use them for screen repair.
Depends on how soon it rains but normally it’s fine once it dries.
Alrighty I did a bucket test, with the valve set at ‘3’ it is drawing a 1:3 ratio, so that’s what…2-3% on the roof? It’s definitely not a 1:1 at wide open, maybe a 40/60 split. Guess I’ll have to open it full.
Make sure the amount of water through that ball valve is the same as when the sh valve is wide open too. A basic ball valve will allow more water in then the metered valves, there’s some restriction in those. I don’t open my water valve wide open, you won’t get right %. You need to run test with them wide open separate to see where your at. Soap shouldn’t be any issue, although I just put my soap in the sh……
Guess I’ll have to add a ball valve then to choke down the water some.
You should see it clean up while you’re up there or if you were shooting from ground in no longer than 10min. Based on way it looks, you were probably pulling about 1%. That onw is pretty bad, would probably want to be around 4%
If it don’t turn white it ain’t right.
It should be inert in 24 hours, max. Don’t do the job if rain is forecast within 24 hours. I’ll drop thre link to the tubing we buy as well, but honestly, we quit using it, and we kill less plants (forces the guys to be more water-conscious, and we are having better results). We always bought the 6-mil, 6" worked on almost all downspouts we encountered, some of the fancier homes run a bit larger gutters/downspouts, so we got some 8" as well.
https://www.amazon.com/gp/product/B084C2PJGN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B000ZJONX6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Someone very wise posted a saying “If it’s brown, it’s coming down. If it’s green or black, you’re coming back”
Once I hit the roof, I make sure all the algae is brown. As @racer said, usually about 10 to 15 minutes should be enough time.
