I've searched this forum but couldn't come to any conclusions on the following. My pool has accumulated some dirt like debris in certain areas. They brush away easily but eventually return in the same spots. This debris is more concentrated by the return jets so part of me thinks this may be a filtration issue. Another part of me, however, thinks this may be a yellow/mustard algae issue. Right not I'm trying to decide whether to open up the filter housing to look for any cracks or issues that would allow debris to get pack into the pool or shock the pool to mustard algae levels. I have attached pictures. My numbers are as follows. Any thoughts and suggestions would be much appreciated. Thanks.