So I'm opening my pool this year and when I pull the cover off the water's much clearer than I've ever seen it at opening but there is a black layer of I guess algae?? on almost the entire bottom of the liner. It brushes off easily but like I said I've never seen it before so I'm confused a little. I'm currently filling the pool but need to know what my process should be for chemicals and brushing/vacuuming. I'm guessing I should go do this:
1 - Add CYA
2 - Start the SLAM process and brush down the walls
3 - Finish the SLAM process
4 - Vacuum to waste
5 - Get TA, PH, and CYA correct
6 - Probably vacuum again (through filter this time)
Does this seem correct? Here are some pictures...