Thanks, Boxhat1. I have been told, here, that the Ph will show false high during SLAM. The last time I tested for it, before starting the SLAM, it was 7.2. Aerated for 2 days, brought it up to 7.6(reliable?). Been running the filter 24/7 since 5/2. I REALLY don't expect a change by tomorrow morning, but I will take pictures. Sorry, Boxhat1, I didn't see that last post till after I was done. How do I know that the chlorine has "done it's job, if I keep seeing a drop in FC?
Thanks, Zea3, you have been supportive!! I tried the DE, adding it as described here, a 1/4 cup at a time until the filter pressure increased by 1 psi. By the next day, pressure dropped back to "normal", about 10 psi. Has NEVER been above 12. The sand is new this season(1 month). In my mind, if I am to filter through a medium that is too coarse to remove the fine particulates that I am trying to get out, wouldn't it be advisable to have a finer filter medium? Is there a BIG difference between filter sand? Is there a medium that filters say, to, 80 microns or a similar measurement?