Add on Soda blaster for pressure washer

Do any of you have or know anything about these add on soda blasting units for pressure washers. I have some hard water deposits on brick for a customer. I did a test with some one restore and it didn't even phase it. I know there are two step processes like using white scum remover then hitting it with NMD 80 while wet but Sometimes that doesn't do the trick either. I was wondering if anyone has used these soda units for this type of work? Here are the results of my test in pics. I applied product once and let it dwell for 20 mins then rinsed and repeated. Not much success.. i have found over the years that this is one of the hardest things to do as there are so many variables.
What say you?

Looks like Efflorescence and NMD80 sometimes works. But try Effortless sometimes it works better. We also use a product called SureKleen 600 on new masonry construction, it will burn you though so be careful. I have a Soda Blaster attachment and used it like 2 times my whole career and was never impressed.