When attempting to vacuum my in floor, in ground pool, dirty cloudy water shoots out of jets and holes at the bottom of the pool. I had a bad algae bloom, it is definitely dead now, chemistry is balance and I just changed the sand. I can't vacuum up the dead algae, it shoots back in to the pool 5 minutes after I connect the vacuum hose. I disconnect the vacuum hose and the dirty cloudy water stops flowing through the holes. It seems like whatever I vacuum (when hose is connected to skimmer) is not even going through the filter and just coming back in the pool. Please impart wisdom. thank you.