@Majestic66 No, I’m going to be running my wfp system out of my van. I don’t always bring my pressure washer trailer with me for jobs. I have a lot of windows only jobs or gutters and windows so there’s no need to bring the trailer.
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In the UK most of the guys will use a 1.1GPM pump rated to 100PSI and on occasion a 150psi pump. Depending on how high your going to be working 60 - 100psi should be ample… A flow controller is also worth the investment as it allows you to alter flow rates and manages current draw of the pump. WCR do stock V11 and V16 controllers For a standard set up look at V16 Basic | Spring (Europe) Ltd The controller is max rated to 15a
If your looking to run a bigger pump say up to 7GPM that has a max current rating of 27a there is a high current controller for these pumps too V16 HC Basic | Spring (Europe) Ltd this is max rated to 40a
John Lee is a good go to guy regard pump controllers
my standard set up now is running from a tank in van.
we use 150" 8mm od tube we add 3/8 if more length needed
we work up to 3 and sometimes 4 stories
i have a 1.1 gpm 40psi pump which runs one pole no problem
i have 2.2 gpm 70 [\psi pump i have used to run 2 poles using a splitter/regulator or 1 pole using a regulator or pump controller. 2.2 is too much volume for the hose/pump will cycle on off without some kind of regulation
mostly i have used cheap analog controllers but at the end of last year i got the v11 with long remote.
the long remote is awesome.
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@Iansheppard you should the ability to run a hose reel from the long remote.
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From the point of view with a pump after the RO/DI:
I will say that the pump you listed above from CWC can work when used with a controller and large diameter host (compared to tubing) for most of your WFP run. Technically, you can use a 5GPM pump for WFP work, but you will need to throttle the connection way down and the pump will cycle a ton, leading to premature ending of life.
Using a 5 GPM pump before your RO/DI will increase your pure water production (flow and pressure) which is awesome. Not heavily recommended if you have a univalve and frequently “turn the WFP off” where it doesn’t shoot water out of the pole. I say this because pressurizing your whole lineup without flow isn’t a good practice. Pumps I worked with will make pressure all you want, and even more than you want if flow shunted, exposing your weakest connection by way of a leak.
I may be overthinking what you are wanting, though. I generate pure water into a tank and then work out of the tank for the day. So I calculate my needs and save water throughout the day’s job so that I don’t waste it (using quick connects, flow controls, etc).
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@jbilsland1 well that took awhile. Sorry for the wait. I actually haven’t been using my pole as much as Im doing more pressure washing. Hopefully this makes sense. Let me know if you have any questions on it.
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Maybe you can answer a couple questions since you have been using 5/16 for so long.
How do you feel 500ft from a water tank through a RHG pump would work out? enough pressure
to get up 4 stories?
Also how does the hose hold up over the years. Especially if it get ran over accidently by a customer, or if you have to pull hose across a road? Not a lot of traffic couple cars an hour.
The RHG pump should be the specs I mentioned in my earlier post. They work fine.
The higher you are the more the pump will have to work, but we run a ton of hose on jobs.
We regularly use two poles with a couple hundred feet per pole on one pump… we can easily run up four stories.
When we are using our 47’ with two 10’ extensions, 67’ total plus a few hundred feet of hose we still have no problem with pressure.
As far as life of hose, depends on the quality of hose you buy. We periodically have to splice a hose with a quick connect fitting and we try our best to keep vehicles off of the hose. Be smart where you park and use safety cones.
(We have hose that’s literally 8-10 years old.)
Hope that helps 
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