This filter uses standard pool plumbing sizes, not small garden hoses.
The inlet and outlet on this VEVOR 150 sq.ft cartridge filter are typically 2.5 inch (≈63 mm) unions / ports.
✔ 2.5" pool hose / flexible PVC (or rigid PVC pipe)
✔ Or 2.5" → 1.5" reducer adapters if your pump uses smaller fittings
✔ Hose clamps if using flexible reinforced pool hose
if this answer does not resolve the current issue, please contact us again for assistance.
By vevor