Hi I have a silver ion cartridge, a SWG, and an ozonator in my new Hot Spring spa. I had the hot tub for about a month and the CYA is about 150, this is before SWG and if I use MPS as an oxidizer do I have to be keep the chlorine level high to combat bacteria or will the ozone and silver take care of it? I also ordered colorq pro 7 to test my water is this a good test kit? Is it true that hot tub users don't have to worry about algae due to it being covered and high temp? Thanks