Am I missing something about downstreaming? I'm genuinely asking - has something changed in the last 2 years since I had a ds setup?
You still have water 'turned on', wet plants decks etc... Walk back to truck and connect chemical then soap everything... Walk back to truck and switch to water again to rinse.... Otherwise you'd have to be doing steps 1 & 3 (pre-wet and rinse) at high pressure, not low pressure, right??
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There are many ways to do this.
You can use a remote control so less walking, a some guys use this but in time, probably a few years or less they wear out, need replacing, etc..... but save a lot of time and effort.
If you have a helper, you can have him go back to the truck or trailer and switch or do it yourself. I do it this way. When you soap a side or two of a house, give it some dwell time while walking to go switch then rinse then go switch back to soap, etc..... It is all how you look at it.
You can just use high pressure nozzles so the injector will not pull chemicals but I prefer to use the low pressure nozzles because of hanging plants, windchimes and other things that they don't want moved, said they would move and did not move or just too big (huge planters that usually crack when you try to move them) to move so you work around things. I like the low pressure nozzles so I can rinse everything without damaging them, blasting them around or pushing more water where you don't want it or need it.
The X-Jet, X-Jet M5 and downstream injector debate has happened dozens of times on most of the forums, plenty to read about if you want to, some are numerous pages of info that is still accurate today so no debate needed.
There are many soaps talked about recently and they are great, I would stay away from those that are not popular as the popular are tried and true and time tested.
I use my X-Jet M5 probably every 2 or so years, last time I used it was over 2 years ago, I looked at it recently and the plug rusted away. I hardly ever use it since I prefer the downstream injector.
I have 200' of hose on the hose reel and like I have mentioned in the past, this is enough to do most small to medium houses. Some houses need 100' to reach the house from the street in a lot of cases so I end up using another 50' or 100' of hose to go around the house to wash it all.
Most of the time I use the 8gpm machine but once in a while I use the 5.6gpm machine with all that hose and it is all 3/8" but I do have 1/2" hose when needed for higher pressure cleaning on concrete.
Hope this helps Cameron. If you have questions, ask.