I used #20 pool sand, filled it between the lines it suggested, made sure to get none in the pipe, backwashed as instructed for 3 minutes and the water was clear. Then I rinsed for 3 minutes as instructed. Then when I put it to filter it was at 10psi which is right on the line between green and yellow. After a day or two of filtering it was in the yellow. I backwashed again the same as before and it dropped back to 10 psi. My question is, why is the filter starting out at such a high psi? Is there something wrong with it? I also get sand in the sediment window when backwashing and have noticed it spitting some sand into the pool after I backwash. Not sure if that is related but unsure of how to proceed at this point.