Hi Carl - thanks for the speedy & informative reply. So to summarize - 1. Remove Nature2 cartridge if poss to eliminate risk of staining / adding any more copper/silver to water. 2. Keep using Tri-Chlor tabs instead of trying to switch to bleach. 3. Possibly let CYA go up as high as 80 (still within normal according to pool suppliers). 4. Try to maintain TC / FC at 5-10 in order to prevent algae?

Any thoughts on whether I should be adding Magenta Stuff every 3 months as a preventative? Not sure of what our fill water normally has in it or if the installer just recommended that because of the Nature2 system.