On purchasing my last batch of Cal-hypo, I switched from pre-packed 1 lb. bags sold by In the Swim to a 25 lb. bucket of granules - Zappit 73. Every time that I add cal-hypo with the Zappit, my water turns translucent and milky for 1 to 2 days depending on if I run my filter 24x7. This never happened with the other brand.
What I'm wondering is there some type of anti-caking agent or something else causing the difference? They are both cal-hypo, but the Zappit at least has 27% "other" ingredients. I'm almost through this 25 lb. bucket and want to buy something next time that doesn't take my pool offline for a day or two.
Any suggestions for what to look for in cal-hypo?
P.S. I know bleach is better, but I've had trouble keeping up with the logistics of the quantities needed to keep the pool sparkling.