Long time since I’ve posted. I’m assuming this is efflorescence. I have read a fair amount about it and until this job comes up, I’ve never treated it. Seems like F9 Efflo is the go to. This is a large job on a lake and a referral. So, I feel obligated. Previous washer doesn’t recall even seeing it before so I’m guessing it was very mild in places. Homeowner says it was just washed off with pressure.
Anyone deal with this type of stone? I’m assuming it is pretty much the same as any other stone/brick?
Any quick tips/suggestions? My understanding is this can come back a few times before all the salt has come out??? It was a little powdery when I scratched it with my fingernail.
since no one chimed in yet, and I am just sitting at my desk, I will say it is likely efflorescence, but white on block/stone can also be white scum. Each manufacturer has a product for removal.
Efflorescence is due to the water and salt, and left unfixed will continually reappear, unless it is just new and wet
https://www.gobrick.com/docs/default-source/read-research-documents/technicalnotes/tn23a.pdf?sfvrsn=0#:~:text=CAUSES%20OF%20EFFLORESCENCE,-There%20are%20many&text=Simply%20stated%2C%20efflorescence%20occurs%20when,are%20left%20on%20the%20surface.
White scum is due to improper application of a cleaner
Here is Eaco Chems material on it https://www.eacochem.com/docs/lit/Booklet_EOC.pdf
Choose whatever manufacturer’s product you choose and I will add to always test in an inconspicuous area.
Having said all that, that wall looks like a homeowner job. Too many unbroken straight lines for a mason to have done it, unless there was patchwork done.
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Thank you for your input. Much appreciated!
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