# SH draw question **URL:** \ **Category:** Newbie Questions\ **Created:** [July 23, 2025, 11:19pm UTC](https://pressurewashingresource.com/community/t/sh-draw-question/40290 "2025-07-23T23:19:12Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Bran](https://pressurewashingresource.com/community/letter_avatar_proxy/v4/letter/b/e56c9b/32.png) [@Bran](https://pressurewashingresource.com/community/u/Bran)\ **Post date:** [July 23, 2025, 11:19pm UTC](https://pressurewashingresource.com/community/t/sh-draw-question/40290/1 "2025-07-23T23:19:12Z")
Hey all, so i did a draw test using my soap nozzle My machine is 15lpm set to 2500psi. I drew 1.3 litres and ended up with 17.5 liters in my bucket giving me roughly 1.3 to 16.2 ratio Am i right in thinking even if i draw straight 12.5 percent SH it will always be so weak its usable? Is my only option a x jet or wash down gun? Or should i say is there a cheaper option? I didnt try and find the answer to this before posting Thanks bran ---
**Author:** ![CleanWNC](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/cleanwnc/32/45873_2.png) [@CleanWNC](https://pressurewashingresource.com/community/u/CleanWNC)\ **Post date:** [July 24, 2025, 8:30pm UTC](https://pressurewashingresource.com/community/t/sh-draw-question/40290/2 "2025-07-24T20:30:18Z")
Its just my experience but doing 1:10 I usually cut my housewash mix 50/50 with water/SH and if I need it a little stronger I’ll throttle the machine down a little which kicks the draw ratio up in your favor. I’ve cleaned some nasty stuff with just downstreaming that 6% house wash mix though (.5% ish at gun), dwell time and a second coat are the tools I lean on rather than trying to up the strength of the mix. what’s your machine and whats the injector orifice and how many feet of hose are you running? ---
**Author:** ![Bran](https://pressurewashingresource.com/community/letter_avatar_proxy/v4/letter/b/e56c9b/32.png) [@Bran](https://pressurewashingresource.com/community/u/Bran)\ **Post date:** [July 24, 2025, 11:04pm UTC](https://pressurewashingresource.com/community/t/sh-draw-question/40290/3 "2025-07-24T23:04:46Z")
15lpm 4000psi but ive reduced it to 2500 psi. Im not sure what the injector orifice is. Im a complete newbie but i seems i need more like a 10:1 so if I draw straight 12.5% ill be spraying 1.25 which from what i read is good for pre treating a concrete drive. ---
**Author:** ![CleanWNC](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/cleanwnc/32/45873_2.png) [@CleanWNC](https://pressurewashingresource.com/community/u/CleanWNC)\ **Post date:** [July 25, 2025, 12:00pm UTC](https://pressurewashingresource.com/community/t/sh-draw-question/40290/4 "2025-07-25T12:00:22Z")
Yeah I think you definitely want 10:1. What injector do you use? I am using the GP 100950 Fixed Chemical Injector (High Draw - Acid Kit) - 5.0 to 8.0 gpm - its 2.1mm orifice with 5.5GPM and 200’ of 3/8" hose. It works great. I’m not sure you necessarily need to downstream straight SH, I had been pre-treating driveways and cleaning houses with downstreamed straight SH and it was working great then I switched things around on my truck and I have a dedicated house wash tank I downstream from and I’ve been keeping it around 50/50 (+a little surfactant) and it still works great…maybe I intuitively apply a little thicker coat on so the total SH comes up a little more with the 50/50 but I prefer to have the mix pretty dilute because then when I downstream around plants or whatever I don’t really want SH on its easier/safer to rinse off. I post treat with that mix too and it works really good.