Not finding that model; here's the Pentair brochure: http://www.pentairpool.com/pdfs/cleanclearplusDS.pdf

There is a CCP420 and there are some Clean and Clear filters (no "Plus"), but the lowest they go is a CC50.

The Hayward Pro Grid is a DE filter. Have you ever used a DE filter? They are not very forgiving, and can be rather messy to service.