I had my pool plastered and filled about three weeks ago. As of the last two days my polaris 480 has been collecting a white substance that is fine. I thought it was salt collecting in the bags at first. Then I notice that there was a candy rapper that had the sugar in one pouch and a dipping stick in the other. I so then I thought one of the kids was eating the candy and dropped it in the pool. But its been three days and I run the vacuum every night. ther is still a good amount of hte white granular substance in the polaris. Is this the plaster leaching somoe kind of substance?