Lokesh- I concur with George. First - check your source water and your pre-treatment processes. Then - the filter material itself. One annoying problem we faced was the angular grain shape of the filter sand, which had orders of magnitude lower k, than would have been expected based only on grain size. Look at your filter material under a microscope - if it is moderately sub-rounded to well-rounded, then that is not the issue. However, if it is sub-angular to angular, that may be an important part of the issue.
Published by Greg Moss, Environmental Management/Hydrogeologist
Lokesh- I concur with George. First - check your source water and your pre-treatment processes. Then - the filter material itself. One annoying problem we faced was the angular grain shape of the filter sand, which had orders of magnitude lower k, than would have been expected based only on grain size. Look at your filter material under a microscope - if it is moderately sub-rounded to well-rounded, then that is not the issue. However, if it is sub-angular to angular, that may be an important part of the issue.