Hi. Just opened the pool and it is a green mess. I checked my CYA and I am assuming it is 0 because the test kit only went to 20 and I could still see the dot clearly. I put CYA (4 pounds) in two socks and put them in the skimmer baskets. I started adding bleach based on the lowest CYA on the chart so it was a shock FC of 10. I also added trichlor to try to bring the CYA up because the 4 pounds was not enough. Within this time my pressure has maxed out 3 times. The first time I took the DE filter out and hosed it off and replaced then started it up and added 6 scoops DE. After about 2 hours or less it maxed again. This time I backwashed and did not replace the DE. It maxed out again within 30 minutes. By this time it was late night so I turned off the filter in order not to cause damage overnight. There is no blockage in the pressure gauge. By the way it is still a green.