Snails will be fine, I have had fresh water snails in all types of freshwater set ups. Depending on fish you will need to figure out what snails will be best. I find any color myster snails will work almost anywhere, some smaller snails need to be with smaller fish, and shrimp. Just look into what species you want.
there are quite literally hundreds of species of freshwater snails, with different reproduction strategies, diets, stocking densities, and size. Here are just a few of my favorites:
None of these can withstand "extreme chemicals", or really most chemicals, and all have specialized breeding, so easy to control populations. Be cautious with the advice you take on snails, there are a lot of people who are wildly unfamiliar with the diversity and care of freshwater invertebrates who also perpetuate many myths.