10 Best In-Ground Swimming Pool Filters 2025 in the United States

The Hayward W3C3030 SwimClear Cartridge Pool Filter is designed with a top manifold configuration, offering excellent filtration and hydraulic performance. This can help reduce operating costs, which is a significant advantage. The filter's 325-square-foot cartridge is cleanable, which eliminates the need for backwashing and makes maintenance simpler and more eco-friendly. This is an appealing feature for users looking to save on water usage and maintenance time.

The heavy-duty tank and tamper-proof flange clamp ensure durability and security, making it a long-lasting option for pool owners who face tough environmental conditions. Additionally, the high-capacity manual air relief valve simplifies the process of bleeding air from the system, enhancing ease of use. However, the filter is relatively heavy at 74.8 pounds, which could make installation more challenging. It also has a large footprint, so space considerations are necessary.

The Hayward W3S180T ProSeries is an 18-inch top-mount sand filter designed mainly for above-ground pools but often considered by users familiar with in-ground pool filtration as well. It uses sand as the filter medium, a common and effective choice for trapping dirt and debris. The filter features a strong, corrosion-proof build that stands up well to weather and promises durability over time.

Its design includes an umbrella-fold lateral system and a top diffuser that help water flow evenly through the sand, improving filtration efficiency and making backwashing (cleaning the filter) more thorough and balanced. The 7-position VariFlo valve allows easy adjustment of water flow, helping maintain good pressure without straining the system. Maintenance is straightforward with a large drain valve to quickly empty water and sand when servicing or winterizing.

Sand filters require periodic sand replacement every few years to keep filtering well. This Hayward filter is a solid choice for pool owners seeking a reliable, easy-to-maintain sand filter with good durability, especially suited for small to medium-sized pools.

The Pentair EC-160301 Clean & Clear Plus 420 sq. ft. Cartridge Pool Filter is a solid option for in-ground pool owners looking for efficient filtration with a large dirt capacity. This model uses four polyester filter cartridges, which provide a substantial filter area of 420 square feet, ensuring effective filtration and reducing the frequency of cleaning. The 2-inch unions are designed for easy installation and connectivity to the pool system, while the 1-1/2 inch drain makes winterizing the pool more convenient.

An internal air bleed system helps to maintain optimal performance by preventing air build-up within the filter unit. Weighing 74 pounds, it is relatively heavy, which might be a consideration for some users during installation or maintenance. In terms of durability and lifespan, Pentair is known for producing reliable pool equipment, but potential buyers should be aware that regular maintenance of the filter cartridges is necessary to ensure long-term efficiency.

This filter is best suited for pool owners who prioritize robust filtration capacity and are willing to perform regular maintenance to keep their system running smoothly.