Eco-Series Sonata Filter, 18″ opening; Max 50 gpm

The WF18E ECO‑Series® Sonata Filter is designed to provide dependable biological filtration for ponds up to 1800 gallons, using a high‑surface‑area media system that helps maintain clean, clear, and healthy water. Pond water flows upward through layered filter pads and Bio‑Blox media, allowing suspended debris to be captured while beneficial bacteria support natural biological processing of organic waste. The patented Spliner Lock system secures the liner without bolts, silicone, or puncturing, making installation fast and user‑friendly for both professionals and DIY pond builders. With a maximum flow rate of 50 gpm and an 18‑inch waterfall opening, the Sonata Filter creates a strong, visually appealing waterfall while providing reliable filtration performance for long‑term pond health.