Let me start with I manually vacuum our pool. Most of the year we get very little debris in our pool. At times like that I may vacuum only once a week. Then there times like now when we get high winds, though this year they have increased in strength and frequency – we get LOTS of sand daily. Since the water is still too cold to use the pool, I'm vacuuming twice a week. Is there a problem with letting 4 days of sand sitting in the pool?