Me and My Husband just got a new home with a built in pool our first in ground pool . It is an older pool but it has a sand filter on it.We backwashed it because it was turning green. But Now for Some Reason we have sand in the shallow end skimmer and he has backwashed it as the pool companies told us to do. we did it exactly the way we were told to , we turned the pump off, turned the valve to backwash and let it run for about 5 minutes , we then turned the pump off and turned the valve to rinse we rinsed for about 45 seconds to a minute, then we turned it back to the filter . yesterday we got in the pool and I noticed something felt like dirt when we checked the skimmers the one in the shallow end has sand under the basket. what is a reason it would have sand in it and how do we fix it ? And last but not least will it affect or mess up the pool or skimmer?

Angie