Algae on liner.

It looks great and you may have done a slam but when you get your kit I would do a FC/CC test and the overnight chlorine test to make sure you did the SLAM and not just killed what you can see but it's still in there waiting.
You are done when:
CC is 0.5 or lower;
You pass an OCLT (ie overnight FC loss test shows a loss of 1.0 ppm or less);
And the water is clear.

You need to completely kill all the algae with chlorine and then maintain a proper level to keep it away.
 
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