The issue is that the pool is set to filter, but it is pretty much just recirculating. Even my tank pressure is running around 6 psi which is too low, if the water was being filtered the pressure would be higher, around 10 psi.
My psi was around 10psi and barely moved so I thought maybe it was not filtering properly. I took TFPs advice and added a small amount of DE to my sand filter (according to the instructions on their link) and my psi increased to 22psi, so filter was working. I also learned that I was backwashing too much prior to adding the DE. I was not waiting for psi to get high enough. I was able to purchase a small bag of DE from Amazon.
I passed step 1 and 2 of the SLAM criteria, but was still having issue with cloudy water. I have a small leak in my pool so could not wait a few days for filter to remove the cloudiness on it's own. I finally added Floc, circulated for a couple of hours then turned pump off overnight. Water was crystal clear this morning with lots of dead algae on the pool floor. I just finished vacuuming to waste and was able to get a lot of it out. I am letting the water settle again and will vacuum later today. Hopefully will be able to find leak now that I can see the bottom of pool.
My pool was really green and after spending over $200 on chemicals from the pool store with no results after 2 weeks I came to TFP for help. Following SLAM instructions my pool went from green to blue in about 3 to 4 days.