A digital flow controller will help be consistent with flow since you may find an exact power level you like you can then match it. Also some help the pump to maintain full speed until the battery is dead, whereas with no digital controller it’ll die down before fully losing power. I’ve only been there once after boosting for a big day and there was some still left.
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@Lavage de vitres Uniqu’eau
Thanks for your help Ben!
I went ahead and ordered everything off your parts list. I did go with a slightly larger battery and the analog controller. I’ll see how that works before switching to a digital if needed.
Analog controller has worked great for us for a year and a half now.
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That pump should only draw 5-6 amps at full power. I have the 1.8gpm 100psi shurflo, and that’s rated at 7 amps.
so by slowing it down with a controller, you can see how 18ah is more than sufficient 
Thanks again guys! Got mine all built and out in the field with my cheap PVC cart 
Just wondering has anyone wired in a volt meter to see what kind of charge is left on the battery or would that not work with the speed controller?
Can someone who has built this test the gpm coming out of the pump when pressure fed (from municipal water source)? I mean without any restrictions from the filters…just a bucket test right off the box outlet with the pump running. I know the pump is rated for 1.8gpm but I’m curious if it passes significantly more flow when pressure fed and still boosts psi up to 100ish. I think the 120v wayne booster pumps match the inlet flow and simply boost its pressure, and I wonder if that’s how the 12v works, or if its limited to 1.8gpm. Thanks.
Just ordered all the parts minus the battery since they were all out of stock on Amazon.
You’re in for a fun project!
Does anyone know if it’s ok to use these pumps with chemicals? I’m not doing as much window cleaning now, but this little pump setup is still one of my favorite toys! I thought it would be useful with chems, F-18 in particular, but I don’t want to destroy it in 5 minutes either!
Jesse
Atlas Services - Exterior Cleaning Specialists
North Carolina
Atlas Services | Asheville, NC’s #1 Power Washing
It is a chemical spray pump, made mostly for agricultural chemicals. Depending on what you’re spraying you can always email shurflo and check to be sure.
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Good to know. Not really sure how I missed that! LOL. I just set it up as a water pump, so I didn’t learn much more about it. Thank you for the help!
Jesse
Atlas Services - Exterior Cleaning Specialists
North Carolina
Atlas Services | Asheville, NC’s #1 Power Washing
That is exactly what I want to use it for. Just haven’t got around to doing it. :).
Really nice if Caleb to put up a parts list like that. I give him props for that 
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Yeah…I would never have attempted that project without the parts list. That was an awesome thing to do!
Jesse
Atlas Services - Exterior Cleaning Specialists
North Carolina
Atlas Services | Asheville, NC’s #1 Power Washing
How does the control knob mount in the box it looks if I cut a hole for it it would just fall out. Are you guys gluing or something else for the control knob. Going to start putting this thing together.
In my detailed video where I show the guts of the box you should be able to see where I mounted it on the underside of the cover. The electrical board has mounting holes. You can find some small bolts, nuts, and washers to mount it down solid.
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Thanks I figured it out. It was a brain fart
Chems are all I use mine for. Laying down hot mix in a controlled way, f-9 barc, brightening with oxalic on a deck, works great on all of it. Just flush it out like you do your roof pump and you’ll be good.
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Thank you for the info!
Jesse
Atlas Services - Exterior Cleaning Specialists
North Carolina
Atlas Services | Asheville, NC’s #1 Power Washing
Here’s a follow up video showing the little diy pump box going strong after several years of use. @Lavage_de_vitres_Uni is using it for those smaller jobs that don’t need a full system hooked up to a water source. Quality equipment!
This thread was very helpful for my own pump box project.
That’s a sweet little machine! Love the height of the handle…Good for the ol’ back.
