I'm going on 3 years as a hot tub owner. I started with using the inline system on my Marquis Destiny, with one bromine cartridge and one mineral cartridge. Then I switched to a floating sanitizer dispenser and just put 2 mineral cartridges in the inline system. Now I use chlorine granules as needed and just the mineral cartridges inline.
I'm kind of sick of spending almost $60 every time I change the water to replace the mineral cartridges, and I don't like the environmental waste of the cartridges either. Would it be OK to leave the inline system empty and instead use something else for minerals? Are there any more environmentally friendly (and inexpensive) options for minerals?
Thanks in advance.