OAK Refills & Filters | The Liquid Tree

Keep Your OAK Living at Its Best

Your OAK — The Liquid Tree works hardest when its algae is fresh and its filter is clean. These refill and filter options make it effortless to maintain peak air purification performance: removing 99.99% of dust and continuously producing fresh oxygen.

Choose Your Refill Option

• 6-Month Algae & Nutrient Refill ($300) — Fresh live spirulina culture + full nutrient pack to sustain your OAK's living ecosystem for 6 months.
• 6-Month Refill + New HEPA Filter ($325) — The complete renewal bundle. Best value.
• New HEPA Filter ($50) — Standalone HEPA filter replacement. Recommended every 6–12 months.

Compatible with OAK — The Liquid Tree only.