And here I've been thinking of switching up to a DE filter. It filters smaller particles if done properly.
The easiest system these days is cartridge filters. Keep a spare set of filters to swap in, then clean the ones in the filter with a hose and spray nozzle. You do this about every 6 months.
You might consider a newer DE filter like the one from Hayward.
Perflex | Filters | In Ground Pool Filters - Hayward Pool Products
Here are the cartridge filters
Filters | In Ground Pool Filters - Hayward Pool Products
I have the Swimclear
SwimClear | Filters | In Ground Pool Filters - Hayward Pool Products
And if you are getting these replaced, go ahead and get a new pump with a VFD.