HANXER System 3 S7M120 Pool Filter Set — Inner & Outer Replacement 300 sq.ft., 20–30 Micron Trilobal Fabric

HANXER System 3 S7M120 inner and outer filter set is a direct replacement cartridge pair (300 sq.ft.) compatible with SR300, Sta‑Rite 25021‑0200S and 25022‑0201S pool systems.

If your System 3 SR300 or compatible Sta‑Rite filter is working harder than it used to, this HANXER replacement set restores efficient mechanical filtration. The two-piece kit combines an 100 sq.ft. inner element and a 200 sq.ft. outer element made from trilobal filtration fabric and an upgraded 20–30 micron filtering layer to trap fine particles and extend time between services.

How does this replacement improve water clarity?

The trilobal fiber structure increases surface area to capture more debris than ordinary pleated media. A denser 20–30 micron layer targets fine sediment, hair and sand, so pools stay clearer between cleanings. Reinforced end caps and a sturdy ABS inner support maintain filter shape and performance under pressure.

• Trilobal fabric offers greater adsorption surface than standard fibers
• 20–30 micron layer captures smaller particulates for clearer water
• Reinforced construction resists deformation and extends life

Will these cartridges fit my System 3 or Sta‑Rite model?

These HANXER cartridges are designed as direct replacements for the listed part numbers: inner 25021‑0200/S7M120 and outer 25022‑0201S. Before ordering, compare dimensions to your existing parts to confirm compatibility and avoid returns.

• Inner: 24" length, 9" outside diameter, 100 sq.ft. filtration area
• Outer: 18" length, 16" outside diameter, 200 sq.ft. filtration area
• Intended replacements: 25021‑0200, 25021‑0200S, 25022‑0201S

How easy is maintenance and cleaning?

Routine rinsing with a garden hose will remove surface grime and help the filter last longer, though these elements are not designed for backwashing. Proper cleaning and gentle handling preserve the filter fabric and adhesives; when wear appears, replacing the cartridge restores peak filtering.

• Rinse regularly with clean water; do not use backwash
• Inspect end caps and adhesive tape for signs of wear
• Replace when cleaning no longer restores flow or clarity

What safety and quality assurances come with HANXER filters?

HANXER pool and spa filters undergo IAPMO testing and meet NSF safety standards for long‑term water contact, ensuring no harmful substances leach into your pool. The replacement set includes reinforced materials and validated components to deliver reliable, safer filtration.

• IAPMO tested in accordance with NSF safety requirements
• BPA‑free, odorless materials that leave no residue
• Six‑month after‑sales support for defects or fit issues

Who is this for: Owners of System 3 SR300 and compatible Sta‑Rite pool systems who need a full inner + outer cartridge replacement to restore efficient filtration. This set suits backyard pool and spa operators who want an affordable, NSF‑tested option with reinforced construction and improved fine‑particle capture. Compare the stated dimensions and part numbers to your current cartridges before ordering to ensure proper fit and maximum performance.