Gee, it sounds almost as if you are fighting bacquacil or used a bromine concoction to kill algae. Those folks have to use lots and lots and lots of bleach before the pool settles down. BTW, I've forgotten--is your pH correct? Toward the low end of the 7.3-78 range? Have you considered keeping it between 7.0 and 7.4? Chlorine is more effective at lower pH levels.

Leslies usually has the reagent refills, and they sell them from their on-line site as well. They also have a FAS-DPD kit. Of course, Taylor's on-line site has all that stuff too.