I am in the process of transforming my swamp. I have been passing OCLT and I decided to try adding some DE. It takes my sand filter about 4 days to go up 1 psi. I added enough DE to bring my pressure up by 1 and 10min later I had to BW. The water was very dark and dirty. I added the same amount of DE and in another 10 min I had to BW again but this time the water wasn't as dark. Is it normal to rise so quickly when trying to clear your pool?