Bill I can't remember why, but I recall research that stated not a good idea to use the pool /aquarium products for a prolonged period of time...emergency sit's, OK, but I can tell you that I used vinegar, before and it works, also pickle juice, I've been told for PHdown alternative...and I do believe that I once almost used baking soda for ph up,
I didn't though, I just made new water...hope this helps you out