I have a Vacanza Series spa and e-mailed the manufacturer e-mail that's in the owners manual asking if I could use Borate/Epsom salt and how much if so. They said if its not in the manual that it would void the warranty. Is there really any way for them to tell if I make sure its drained before any calls if I had an issue? How likely is it that borate or epsom salt would cause a problem if I kept the amounts to certain levels?
The way I read it is you only have to add Borate up to 50 ppm and than add again after a drain a refill as the level should stay pretty high as there isn't much from water loss due to people getting out. The same would be true for Epsom salt...add to a certain level and than don't add more till a refill. I know salt can corrode, but as long as the chemistry is good it shouldn't be a problem.
Also if model number matters..I'm not sure where to find that information so if someone can tell me where to find it. I saw nothing in the manual about specific model.