Pond Filter Choice: Biological > UV, Aquascape Designs Resource

165-gal pond, 5 goldfish, SC sun, 330 GPH pump, waterfall — need filter. Biological filter essential; UV secondary.

Filter Priority

1. Biological: High-surface media (K1, Matala, lava rock) — processes waste.
2. Mechanical: Foam/matting — catches debris.
3. UV: Clarifies green water — but needs biofilter to remove dead algae.

UV Specifics

• Bulb life: 12 months (replace yearly).
• Run time: 24/7 in algae season; potency determines duration.
• Check manufacturer specs.

Resource

Aquascape Designs website — filter sizing, selection guides, videos.

Biofilter first. UV if green water persists. Aquascape has the charts.