While you have the assembly out, check it really well for any cracks or stretching of the slots in the "fingers" on the laterals. Unfortunately, I think you're going to have to shovel some sand out to get the assembly back in correctly, but I'll let the equipment experts verify that.
My sand filter is a 300 lb filter, but I use zeosand, which requires half--150 lbs. When I added 150 lbs of zeo to my filter, it was just about half full. Do yourself a favor--after you get it all put back together and any sand added, make sure you start it up for the first time in backwash mode--there's a thread on the "lessons learned" forum that described my nightmare when I forgot to take my own advice, but that's a mistake I'll never make again!!
Janet
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