One more thing...
When I removed the filter grids they were all broken inside.
I suppose I need new ones.
The filter is Hayward DE6020.
I saw some grids on Amazon for under $200, but other places are selling them for close to $700.
I am confused.
There appear to be 7 large and one small grids.

If someone could show me what to buy and where I'd greatly appreciate it!