I got black stains when we opened pool.I think fertilizer got in the pool.How can I remove it?Thanks

Try vitamin C (ascorbic acid) on it. Most fertilizer blends have iron compounds in them as a micronutrient.

CVS or Walgreens or grocery store - Vitamin C tablets (1000mg per tablet....skip the rose hip flavored one ;) ). Crush up a bunch, put it in a nylon and let it sit on the spot. If it’s iron, it will lighten up
 
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