I am in the process of having masonry work done around the pool and have a lot of fine silt in the pool which I am trying to clean up. I have noticed that some of the fine silt is passing through my DE filter. The filter was brand new last year and the pool was closed by the pool builder. I am assuming that he backwashed the filter as part of the closing. Since I did not have time to open the filter and do a thorough cleaning, I added 3 pounds of DE (filter is rated for 5 pounds). Could I not have enough DE in the filter which is causing the silt to pass through? Will a DE filter typically catch fine silt?