I Just had my pool opened and i noticed my pressure on my filter was up to almost 30psi within the first few hours of my pump running. So i decided to take the filter Grid out and clean it. Added DE back to it and the pressure was down to 13psi. 2 hours later my pressure is back up to 25psi once again. So i backwashed it pressure drops and about an hour later starts climbing again. My DE grid was there when i bought my house 6 years ago so i dont know how long the previous owner had it for its doesnt seem to be in horrible condition or anything but i didnt do a full inspection on it. Is it possible that it could just need to he replaced? Also pool ran for almost 10hours yesterday and did not clear up like its done in past years of opening it