I have both on my Whitco machine, One goes right in the pump and has a metering valve so you can adjust the precent of chemical.. This is nice for like mild soap and stuff..However I wouldn't dare run Caustic through my pump as it could damage all kind of stuff.
Bought a down stream the other day.. $ 14.00 at Bozeman Distributors..I use this for all Low pressure soap applications.. Because you have to use a soap nozzle to make this soap injector work.
This is what we do with ours..
1) Cleaning Vent Hoods .. I use Caustic in a pump up sprayer.. I put a mixture of cascade Dishwasing Crystals in a 5 gal bucket and use my low pressure soap injector / nozzle and apply it to the stainless steel hood after cleaning.. This gets rid of water spots..
2) When cleaning Concrete... I use my surface cleaner and put a bucket on the upstream injector .. Set the metering valve to about 1....I use dawn ultra and by doing this it siphons hot dawm at high pressure through my machine and through my surface cleaner....
You have to be careful when using caustic .. Caustic cleans well because it makes water hot or hotter.. I have seen many people run caustic through pressure washer hose and hve the hose blow out or the o ring blow out and get caustic all over them ..Thats why we always tote the caustic in a pump up sprayer..
One thing you got to remember is to clean both of these real good when you are through.. I run Hot water through my upstream and also my downstream every time I get through using them so they want get stopped up.. Also on your upstream make sure the check valve is working properly and is also clean..
Image 19 is our house wash and Building wash machine.. (Homemade) It has a Comet pump 2750 @ 2.5 gpm We run it through a flow switch and burner .. The burner plugs into our whitco's generator or a house outlet..
We use a low pressuure soap mozzle that has been drilled out with a 1/8" drill bit this applys the soap much better.
Then we hook the wall washer up .. As you can see I am replacing the swivel at the time...
By using the cold water machine with the downstream soap system and the running it through the burner the soap and water heat up real hot .. Also by using our drilled out soap nozzle it provides a lather like soap to the surface.. Then when you go back over it with the wall washer ( Surface Cleaner) boy does it clean good..
Image 17 is the upstream on the whitco .. I moved it from the other side of the machine ..it has 1,2,3,4.. Metering of chemical ..hose and a check valve to make sure water does not come flowing out when the trigger is released.
Image 18 is my new downstream , my old one got stopped up so bad it wasn't funny.. But any way I stick the hose in the bucket when I clean concrete and there you have it ...
