Hi byron. Not sure what you mean by chemicals?
These products are usually crushed rock and IMO are no different to a marine aquarist putting limestone in the tank or filter?
So you are aware I had historic issues with fish mortality which was fixed by a raise in pH from these products. I currently use the Seachem 7.0 product. What I'm trying to do is see if there is a none phosphate option to do this.
Seachem are somewhat secretive as to just what is in this. They do mention phosphates, something no one should never add to an aquarium. And they make claims about it neutralizing chlorine, detoxifying ammonia, messing with the pH, precipating calcium and magnesium. I don't consider this at all necessary, nor safe. It should never be used in a planted aquarium obviously, they even say this.
"Fish acclimated to neutral pH" is more scary stuff. Why? No fish in nature lives in pH 7 water, it does not exist in the habitats. Here again it is more messing about for no reason.
[Edit to answer what I missed earlier, sorry.]
I don't recall the issue on raising pH to cure whatever, so can't comment. You didn't answer about the fish species, nor the GH, KH and pH of your source water. I might have more with this info.
I recall being persuaded about 25 years ago by I assume well-meaning members on another forum that I should use something to raise the pH as it was for some reason better. So I used about three tablespoons of dolomite in a nylon pouch in the canister filter. It kept the pH around 6.5 for several years [the natural pH of my tap water in those days was 5 or lower]. I don't think the fish were any better, they were all soft water species. The pH was stable, and dolomite is pure calcium and magnesium carbonate. So there was nothing here to do all those unnecessary things the Seachem neutralizer claims, risking the fish along the way. Eventually I stopped, this was only in the one tank anyway. There are a number of myths in this hobby about all sorts of things.