I have maintained my pool for over 15 year's and never had this problem. In Ohio do to the weather our season didn't start till a week ago. My winter cover is the type that is anchored to the cement walkway. The mesh does allow for fine sediment to filter into the pool. It takes some vacuuming and brushing to clean it up.
So far I have added 7 gallons of 12% chlorine and I'm still having a problem maintaining the chlorine level . The PH is at 7 to 7.2 and the CYA is really low. I do have a chlorinator that I use tablets as a back up. In all the years I have never had to add more than 3 gallons to start.