I definitely would not use that with buffering soil or any Caridina shrimp! *Maybe* neos, if you can find a breeder who keeps them in hard water! But I would imagine that many Neo shrimp may have difficulties thriving in that water because it's too hard... (shell might be too hard, causing difficulties for them to molt.... or?)
This basic water parameter guide recommends a max of 1-2 KH for the most common Caridinas - except Tigers. Most read "1", because the test to find out if it's 0 KH or 1 KH is the same. You would need to double the amount of water to find out if it's 0 KH or 1 KH.
Now, for Tigers, it recommends up to 2-4 KH, for most.
My tap water is 3-4 GH and KH (they usually run the same) with a TDS of ~50. (give or take) I found out the hard way that my tap water is too soft. This, before learning the basic requirements of keeping shrimp.
I bought a cheap but "dirty" remineralizer which works. I'm not crazy about it, because it raises the TDS pretty high!
Lately, I've decided to mix my soft tap with my sisters hard tap. She only lives 10-15 minutes away, however her water comes from an underground aquifer (aka well water) vs my water comes from the river - fed by rain and snow. We both live within walking distance of this river, too...
My sisters water is 10 KH, 19 GH and a TDS of 475.
I mix about 3 1/2 parts soft tap to 1 part hard tap to get desirable water parameters for my shrimp. Using 5 gallons of hard tap water, I can fill a 20 gallon tank up with the desired water parameters, with the rest being soft tap water. (counting substrate and decorations) This is "cleaner", as I'm able to have higher GH but lower TDS in comparison to using the crappy remineralizer. (there are some great shrimp remineralizer products out there though!!!)
I tell you this so that hopefully when you do get shrimp, you will not have to go through the same mistakes as many others who were not aware of the proper water parameters for shrimp, and suffered because of it. (like myself)