My CH was over 600 a few years ago when I used cal-hypo. Once I switched to bleach it's been going down and now it's around (or just under) 200. Should I start adding calcium? If so, what's the best place to get it at? Paying pool store prices after getting household bleach on sales will hurt I wish I had some cal-hypo left I could use it now.
2nd question - When I test my calcium I always see particles, which I was told are metals. They show up many drops before the water changes to blue. One pool store guy (who seemed to be very knowledgeable) would stop adding solution as soon as these particles showed up, not when the color changed to blue... so his numbers were always lower than others who tested my water (including myself)
Should these particles be ignored when testing?
P.S. I use TF100 for my testing.