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We have a commercial 165,000 gallon outdoor pool that has just been re-done. New coping, tile and plaster. We have maintained the pool chemistry relatively well (Cl fluctuates and alkalinity is a bit low) since the pool has been re-done. This morning after almost 4 weeks of the pool looking...

Cl- 2.0 pH-7.6 Alk- 150 Calcium-130 Chemically we use chlorine as a disinfectant. We use CO2 to control pH. Other than that the only thing we add about every other week is a clarifier we get at the local pool store. Our water supply is from a municipal source.

Can someone please assist in identifying what this stain is. These stains are strictly in the deep end of our 6 lane, 25 yard, 165,000 gallon pool. The stains appeared about a month ago and haven't necessarily gotten any worse. It looks like sand at the bottom of the pool but of course when we...