I have a 10inch sandfilter and pump attached to a swg. I have a huge issue with sand getting in the pool. I backwash then rinse then go back to filter. After a few hours theres sand all in the pool. I can not do the back wash and just cut the pump on in the morning and sand again in the pool. All sand filter parts have been inspected and are in working order. I need help with what may be causing this. I recenlty changed the sand as well same issue. All inside compontes are not cracked and have been replaced as well. Pool is intex 18x9x52 with filtration system that came with it besides add in swg.