I just saw this CircuPool TOTALBalance ph control system. It seems great to not have to add acid all the time but it is a bit pricey. How dangerous really is adding the acid if you are pouring 16 oz into an old yogurt container once a week? It is a lot cheaper than the TOTALBalance system but if it is any concern to my health it may be worth it. I have chronic bronchitis and get sick 2-3 months a year and I don't want anything that might make it worse.