Hi, we have a new pool that’s one week old, during the early stages before using the water started to turn a green tinge. We did water test and no chlorine registered but all other quality seemed fine. Pool supplier company put in algicide and shock which cleared up water. Within days a yellow stain appeared around pool and got worse over the next few days. Nobody used any sun cream, tanning cream or any other creams that are known to react with copper based products. The algicide that was used we believe was copper based.Has anybody got any ideas to give possible causes or solutions to remove please - thank you
