Ok. I'm not an expert on persistent black algae, but I can tell you that you need to get your chlorine level up even further, to 25, and keep it there for a number of days before it will stop crashing on you.
Will it get rid of the black algae? I don't know, but you need to brush it daily to have a hope.
I cannot really comment on what Hayward told your friend as it makes no sense whatsover and something must be garbled in translation. There are just too many inconsistencies. I'm no SWCG expert either but I know enough. The t-15 is their biggest cell, designed for pools up to 40K (though you usually want to go bigger than the pool). 3ppm of FC is the normal production level for just about any SWCG and should be matched with a CYA of 60. For the cell to have to run at 100% 24/7 to produce that just doesn't add up. Do you both have the same controller as well?
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