Switched to the BBB method about a month ago couldn't be happier! Today I noticed brownish green spots starting to form in the radius's of the steps and the swim-up seats! Have been doing overnight tests and haven't dropped anymore than .5 so I haven't seen the need to shock. But now there is obiviously algae growing! Now I know the test kit (Taylor) is junk! Just ordered TF-100. I guess the question I have is the POOL CALCULATOR the four box's for suggested FC has SWG 5 Normal 8-13 Shock 25 and Mustard Algae 54. I've been running around 6 with CYA 100, do I shock to 25 or 54? And should I follow SWG or Normal FC levels? And how do I tell mustard Algae from plain old algae?