What would be wrong with the filter? I just had it all apart and inspected everything. I took out the center piece after taking all of the laterals off. Cleaned everyone in water to inspect for cracks. Rinsed filter and got every last bit of sand out, then filled half of water put the internals back in and started adding 350 lbs of pool sand. Backwashed and rinsed and have been filtering since last week. Not sure what else would be wrong with the filter.