I just cleaned my above-ground pool cartridge filter. The pleats were covered with a powder blue residue that washed off with the hose, but pooled on the ground — the only blue things I’ve had in the pool are one blue noodle (new this season) and a solar cover that looks like blue bubble wrap, which I am using for the third season in San Antonio, with temps around 100 degrees the past few months. Could the solar blanket be deteriorating?