can someone tell me how to properly put d.e. in a sand filter?? i'm pretty sure that i need to add d.e. after swimming at night and seeing all those particles floating around near the light, yet my pool is crystal clear. i just brought a 25 lb bag as it was all the pool store carry. thanks for your info. the skimmer sock was not doing the job quick enough. i put the sock on and the next day it was extrmely dirty. im afraid of messing up my pump if i continue using the sock.