Can anyone help identify what this stain is from? At first it looked like a pile of dirt. I used pool brush n dirt scattered but left a couple good size stain. Could it be duck droppings? We have ducks around our area. Thanks
Do you have trees nearby? I would try two things first:
1 - Vitamin C tablet to see if it's iron
2 - Rub the area with a chlorine tablet to see if it's organic.
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