I was researching my mustard algae problem that's hopefully gone for good by completing mustard algae SLAM and noticed that ChemGeek was discussing a recommended FC level for mustard algae on an old thread; not a shock level, but a regular maintenance level FC level. It was said to be 15% of the cya level. This was way back in 2007. Does anyone remember this concept or technique? Does anyone know if any of that sort of recommendation is still a valid technique for those who have or had seen mustard algae in one's pool? If so, for how long? Pre SLAM, post SLAM or from hence ever more? Thanks for being here for all of us!