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Need a second opinion....does this look like black algae to you guys or some other kind of oxidation/reaction? The touch is slightly slippery but not overly slimy. I'm a fairly new pool owner (Oct 2017). I successfully fought a green algae issue in January using the SLAM but now I have what...

I'm a new pool owner fighting an algae problem. The pool was built in the 60's and needs to be resurfaced. Because of that, the gunite is stained and it is difficult to discern the color of the algae that settles out on the floor. I have a sand filter w/ sand that was replaced about a year...