Finally got my tub in. The dealer gave me the chlorine cartridges and Spa Marvel to start with. I asked about the mineral cartridges and he said unless I had bad water (well, very poor city water) that you do not need the Mineral portion if you're using Spa Marvel.
Is it correct that you only need the chlorine part if using Spa Marvel? Does using the mineral cartridge harm anything if using Spa Marvel (I have one I bought that incudes it, not sure if I should just leave it out or use it anyway.)
Thanks!