I typically open up my DE filter and clean the grids in the spring (once a year) but since replacing the filter due to a leak in the old one it appears the new one needs to be torn down twice a year. Is there something different about newer grids ?

I clean the grids when I notice a reduction in time between needed backwash. I backwash when my pressure increases 8psi. So the tear down happens when that 8psi increase starts happening sooner.

Was I simply ignorant in the past and should have been cleaning my old grids more often?