Hello, we are just putting up our first pool. 18x48 bestway brand, and the pump came with it. The pump is Bestway sand filter model #58498E. It came with pool filter balls- and after researching for two days I have no idea if those are a goof option? If they are, how often do I wash them in the washer and so I backwash still? I am still learning about the pump in general and what needs done but I hope someone here will be kind enough to help me. 
