Answer
Apr 07, 2026 - 11:22 AM
The main difference between the Pentair cartridge filter 420 and 520 is their filtration capacity: the 420 model has a filter area of 420 square feet, while the 520 model offers a larger filter area of 520 square feet. This means the 520 can handle higher flow rates and may require less frequent cleaning compared to the 420. Both models are otherwise similar in design and operation.
