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A dark stain appeared on my Pebble Tec marcite back in early spring, about 18” long and 12” wide in a fan shape. From above the waterline it appears almost black, but underwater it looks grey/brown (see underwater pics attached). I first tried rubbing a chlorine tab on it with no results...

Hi, New IG pool in NE FL completed in April. Pepple Tec "marcite" with Rico Rock coping and waterfall. Losing 3.5" water per week, far more than our previous pool which was just a few miles away. Multiple bucket tests show 1/4" loss from bucket, 1/2" from pool per day, even without water...