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Post Info TOPIC: SH dilution with downstreaming


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Posts: 8
SH dilution with downstreaming

A recurring catchphrase on this forum is the dilution is the solution. I am trying to understand the dilution path of SH in a typical downstreaming setup

Obviously, hose length, spray tips and hydraulic head are factors that will affect the draw rate but for arguments sake here is a table that below reflects my understanding.

Question:  Is it correct?

2.5 Gal (in a bucket)12.50%Standard concentration percentage for SH sold locally
1:1 Ratio6.25%Add 2.5 of water to dilute the SH by half (sometimes referred to as 5050)
2:1 Ratio2.08%Potentially achieved with an X-Jet depending on flow rate
5:1 Ratio1.25%

Potentially achieved with a Hi Draw chemical injector

8:1 Ratio0.69%Typical chemical injector

I have recently purchased a 4.5 GPM pressure washer, chemical injector and made my own spray tip using a 1/4"tail (or barb). I was trying to measure the draw rate and it seems I am only getting 18:1 confuse


Here are the results of my test

 Draw fluidMotive fluidDurationRatio
Test 10.132.430 sec18
Test 20.264.7557 sec18
Test 30.264.7557 sec18

To measure draw rate I used a flow meter and fixed amount of liquid to draw.


It is very hard to source injectors locally and I am thinking the injector is not suitable for the flow rate of the pump.

Question: What else could explain such a low draw rate?  



Sky Richardson
Hugo Window Cleaning
Sydney Australia

About me: I am a window cleaner that would like to offer house washing and building washing to my residential and commercial customers. I promise not to ask dumb questions :-)


Status: Offline
Posts: 3

Get a hold of some General Pump Hi Draw injectors- 3-5 gpm in your case. Also make sure the bleach you are using is not old.
I use a 4 gpm machine with the 3-5 gpm General Pump hi draw injector and the dirtiest of homes cleans up down streaming a
50/50 mix of 12.5% sodium hypoclorite and water, with 5 ounces of elemonator added as soap. 5 gallons of mix. Good Luck!

Bill Sullivan
Bill's Window Cleaning
Dartmouth, Nova Scotia.


Bill Sullivan

Bill's Window Cleaning/ Pressure Washing.



Dartmouth, Nova Scotia Canada.

B2W 4X7.

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