Filter cleanings are necessary for nearly all residential swimming pools. 98% of residential swimming pools DE (diatomaceous earth) or Cartridge Filters. You can read more about the various styles of swimming pool filters here. The remaining 1-2% are sand filters which do not disassemble and clean up without a sand change. Commercial and larger sized or olympic size residential swimming pools in comparison are nearly all outfitted with sand filters because they are more durable and less expensive to operate.
Why make the Electric Company rich? A dirty filter is the single biggest power drain in most swimming pools.
Most swimming pool filter manufacturers and swimming pool builders require regular filter cleanings to ensure their warranties are not voided. They usually recommend filter cleanings performed on them every 3-6 months depending on which type of filter and the manufacturer. It's worth it to properly maintain your swimming pool filter based off the electrical savings alone! The amount of amps it is drawing when running before and after your filter cleaning is substantially decreased.