What is a good source for ox? I have been buying citric from Bulk Apothecary (thanks to Racer!) for an amazing price. I would like to have some ox to have in my arsenal.
Thanks in advance.
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I call Rowina at Florida labs directly. I imagine the price is probably pretty similar to bulk apothecary because Florida labs is the least expensive I found on Amazon and they usually quote me a lower price over the phone.
Doesn’t really matter though. Oxalic acid is dirt cheap most places.
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I recently read a comment from someone on Facebook where he said the oxalic takes a while to fully dilute and disassociate, so he said he always mixes his up 3-5 days in advance for best performance.
No idea on the accuracy of that statement, but passing it along.
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@squidskc Hey Brodie, approximately how many gallons do you end up with when you mix a 10 # bag of Fla Labs Oxalic? I met someone last week who was mixing it 12 oz to the gallon. I never thought about weighing it. I think I’ll go try that. BRB
I do half a measuring cup to a full measuring cup depending on strength. I don’t weigh it. But at 16 ounces per pound and 10 lbs per bag that’s 160 oz divided by 12 that 13.3 gallons. 
Just want to say a big thank you to those on this thread giving advice about the use of oxalic acid on rust stains.
I mixed the ratio you suggested, ( 1 Cup per gallon ) no access to hot water so I mixed well in a bucket and then strained the solution into back pack sprayer so that it didn’t clog the filter.
I added further water to any left undissolved in the bucket and then put through strainer.
Took three sprays/brush to get results I was happy with.
All the best
Lammy
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Hey @squidskc, if you don’t mind me asking, what did you charge to remove a stain like that? I see a lot of brick in my area with similar stains.
Thanks
There were a bunch of these stains. The job total was about $4k. They kept adding stains and I went back a couple times before I invoiced.
That one on the wall around the light required a 2 gal pump up filled with oxalic and a 4 gallon filled with water and a service cart. It was on the 4th or 5th floor. If I were doing that one alone, knowing I wouldn’t even have to hook up the trailer I’d probably just charge my minimum of $300. It took all of a 1/2 hour max.
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Wow so you rinsed with a pump up as well on this? No pressure washer?
That is some great profit per hour. Congrats on landing that one!
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I used the PW on everything I could access with it. This particular stain was inaccessible unless I rented a lift. I made due with a couple pump ups and a service cart.
I used the 4 gallon pump up to rinse and had another 5 gallon bucket full of water to rinse more if I needed to. I didn’t use the full 2 gallons of oxalic on this, but rinsed with about 6 gallons.
With trips back and the other stains $4k was just about right.
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Looks great! I love to keep things organized as well, saves time at the start and end of every day that’s for sure.
Does anybody have a spare grinder I could borrow?
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There ya go dude…take this one
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There’s another 18v Milwaukee grinder in the tool box ready for someone to use it.
Battery powered grinders are sure to let you down…
Sandwich grinders will always help you up.
I take it you don’t like changing grinding disks so just have one for each different kind! I like it! Haha
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Cutting wheel, grinding wheel, flap disk, and wire wheel. Those are my go tos 99% of the time. And my favorite grinders are always the cheap(er) ones. I got the two makitas for $35 each, the Ryobi, and (gasp!)the harbor freight one for $40.
The Ryobi is actually my favorite grinder ever! Trigger grip. Handle rotates… it’s a dream boat.
Does anyone else have a favorite grinder?
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I usually stick with the Harbor Freight ones since you can pick them up cheaper than a set of new bushings for the others. I don’t use them as often as it looks like you do though. I like the idea of a trigger, might have to look into the Ryobi.
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Definitely a Metabo and not the new ones Lowe’s is carrying. The 6” is my favorite of the ones I have. Unless I’m polishing then it’s a 9” Makita.
Agree on the cordless grinders. My makita is only good with flap wheels or brushes. Lights start flashing and stalls out. Waste of money.
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