Holtfreter's solution

Many other sites say axies should be kept in Holtfreter's Solution 40% (particularly Ind U Axyl Colony) but I haven't seen much discussion on that here. Is anyone using this? I ordered the salts but had trouble finding out where to get them if not at the university. Lots of info is available on how to mix them but not how to acquire the components. They make it sound like it is really ideal--I am imagining it as a definite QOL improver. Experience? Thoughts?

[Michael Shrom]

Axolotls like hard water. If your water is hard Hoftretters solution is not as important. If your water is soft Hoftretters or some type of minerals and or salts should be added. I'm sure their would be some benifit to using it in hard water but it is not as important to ammend hard water.

Thanks. The water is already hard. Can it be too hard? (Or if it's still liquid it's soft enough?!)
I had one with diarrhea and was hoping the Hof's would clear it up. (I can't tell if it has cleared up--I'd have to put them into smaller containers to tell.) Hoping its not some kind of impaction--I know they took in some green gravel at the pet store, and I see a piece now and then). Both are eating well though--blackworms mainly.