An Introduction to My Pool - Old Plaster - Old Pool - Black Algae !

AH, Thought you were out of startup. Then stick with 1.5-3 for your startup FC. Sorry.
@PoolStored @ajw22

An odd phenomena has occured. I tested this morning and my Chlorine is reading 12 ppm after a pretty heavy rain last night. I brought chlorine from 1 to 3 ppm yesterday and I added the maintenance dose of the jack's magic blue yesterday could this have something to do with it?