Hey there, I have a question regarding pre treat / post treat. I have a 3gmp 2700 psi, DS injector pulls 9:1. I can only find 10% SH. I would probably get about a 1% strength with 10% SH. I know this is a weak mix if I just pull straight SH. If I’m pre treating should I let it dwell a bit longer? Or am I basically wasting time and money on SH if my pre treatment is weak.
I pm’d you back so check your messages for the info.
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Never been a fan of pre-treatment… but I know some people swear by it. I prefer to do concrete cleaning without a mask. 
Most residential I post-treat at 2-3%. You could grab a 20% injector and get close to that. I don’t think would be a waste but on some concrete, you might have to hit it twice. I’ve never had luck with 1%.
What injector do you think pulls 20%?
This guy pulls 20%… https://americanpressuresystems.com/shop/ci-20-3-to-5-qc/
This one is rated for 30% - never tried that lol. https://americanpressuresystems.com/shop/ci-30-3-to-5/
Many guys on here have tried those 20% injectors. We’d all be using them if they really worked.
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They must test them on a 1.2 gpm washer. The High Draw beat out the 33%-50% super suds sucker. That was a waste of money and time…lol
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Haha - ok fair point I admit I don’t use them I use a 12v so shame on me for passing bad info. Thanks for the real scoop.
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