I would like to add borates to my pool. However, I foster dogs and some of the dogs prefer the extra large water bowl that i call a pool. These dogs are only with me for a week to a month which is not long enough to train them not to drink from the pool. Also, some dogs are undergoing treatment for serious health issues (heart worm, ehrlichia, intestinal parasites, etc) and I don't want to add to their health problems.
I was wondering how much salt I should add that will: a) discourage the foster dogs from drinking the pool water, and b) not be too high to impact my equipment?