I put some shock in my pool and around the 3ft shallow area it turned a dark grey, almost black.
I tried using a wire brush and the robot to remove it and it won't come off.
I also have a Floatron and a electric heater.
[attachment=2:3n5q5wec]ImageUploadedByTapatalk1375140070.228005.jpg[/attachment:3n5q5wec][attachment=1:3n5q5wec]ImageUploadedByTapatalk1375140092.549796.jpg[/attachment:3n5q5wec][attachment=0:3n5q5wec]ImageUploadedByTapatalk1375140102.577598.jpg[/attachment:3n5q5wec]
It almost looks like a metal stain or something.
I tried using a wire brush and the robot to remove it and it won't come off.
I also have a Floatron and a electric heater.
[attachment=2:3n5q5wec]ImageUploadedByTapatalk1375140070.228005.jpg[/attachment:3n5q5wec][attachment=1:3n5q5wec]ImageUploadedByTapatalk1375140092.549796.jpg[/attachment:3n5q5wec][attachment=0:3n5q5wec]ImageUploadedByTapatalk1375140102.577598.jpg[/attachment:3n5q5wec]
It almost looks like a metal stain or something.