How to Produce Oxygen with Aquatic Plants
Build a functional photosynthetic oxygen chamber using aquatic plants and inverted glassware to generate and capture visible, breathable oxygen bubbles at home.
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🧰 Required Tools & Equipment
- ✓ Clear glass mason jar (1 quart)
- ✓ Clear glass funnel (3-inch diameter)
- ✓ Glass test tube or narrow 20ml glass vial
- ✓ Full-spectrum LED desk lamp (10W to 15W)
- ✓ Stainless steel kitchen tongs
- ✓ Teaspoon measuring spoon
📦 Materials & Supplies
- ✓ 6-8 fresh Elodea or Hornwort sprigs (6 inches long)
- ✓ 1 quart dechlorinated tap water
- ✓ 1/4 teaspoon sodium bicarbonate (baking soda)
- ✓ Silicone vacuum grease or petroleum jelly (optional)
⚠️ Safety Checkpoints & Warnings
- • Inspect all glassware for micro-cracks or chips before submerging to avoid breakage cuts.
- • Position the electric lamp cord safely away from water reservoirs to prevent electrical hazards.
- • Keep all testing materials food-grade and non-hazardous; do not ingest experimental water.
📋 Step-by-Step Guide (6 Steps)
Prepare the Carbon-Enriched Water Solution
Fill your clean glass mason jar with room-temperature dechlorinated water, leaving approximately one inch of headspace at the rim. Add 1/4 teaspoon of sodium bicarbonate to provide an abundant dissolved carbon dioxide source for active plant photosynthesis. Stir gently with a clean spoon until the powder completely dissolves and the liquid is crystal clear.
- • Water is fully transparent with zero floating bicarbonate granules
- • Liquid level sits 1 inch below the jar mouth
- • Using chlorinated cold water directly from the tap which stunts plant cellular activity
- • Over-saturating the water with baking soda, altering pH too drastically
Prepare and Position Aquatic Plant Stems
Select 6 to 8 vibrant green Elodea or Hornwort sprigs and trim the base of each stem at a 45-degree angle under water using clean scissors. Place the stems cut-side facing upward at the bottom of the mason jar so that gas emission points point directly toward the collection zone. Gently bunch the lower foliage together using tongs so the plant mass stays submerged at the jar base.
- • Plant stems sit neatly at the base of the jar without floating to the surface
- • Cut stem ends point upward toward the jar opening
- • Crushing the stem vascular tissue with excessive force during trimming
- • Arranging stems sideways which directs bubbles away from the collection funnel
Seat the Inverted Glass Funnel
Lower the wide opening of the glass funnel over the submerged aquatic plant cluster inside the jar. Ensure the wide rim sits completely beneath the water surface while covering all trimmed stem ends. The narrow glass stem of the funnel must point vertically upward toward the top opening of the jar.
- • Funnel base rests flat over the plant cluster without pinning stems against glass
- • Funnel stem points vertically upward toward the water line
- • Trapping large air pockets under the funnel rim during placement
- • Knocking stems loose so they float outside the funnel capture zone
Prime and Invert the Gas Collection Tube
Submerge the test tube horizontally into a separate water bowl until every air bubble escapes and it is 100% water-filled. Cover the open mouth tightly with your gloved thumb, invert the tube, and lower it into the jar beneath the water line. Slip the tube mouth over the upright funnel stem before releasing your thumb so no atmospheric air enters.
- • Test tube stands inverted over the funnel stem completely full of water
- • Zero ambient air bubbles present at the sealed dome of the test tube
- • Releasing your thumb before crossing below the water surface, letting room air inside
- • Misaligning the tube mouth with the funnel stem, allowing escaping bubbles to bypass the tube
Illuminate and Initiate Air Production
Position your LED grow lamp roughly 4 to 6 inches away from the mason jar, aiming the light beam directly at the submerged foliage. Turn on the light and observe the cut stem tips closely under bright illumination. Within 5 to 10 minutes, streams of tiny, pure oxygen gas bubbles will detach from the stems and rise through the funnel.
- • Visible, steady streams of micro-bubbles rising through the funnel stem
- • Lamp head positioned stable and dry 4 to 6 inches from the jar side
- • Using an incandescent bulb that overheats and cooks the plant tissue
- • Placing the light source too far away, which drastically slows down photosynthetic rates
Monitor Gas Displacement and Collection
Leave the setup illuminated for 2 to 4 hours while continuous photosynthetic gas production takes place. As oxygen bubbles accumulate inside the inverted test tube, they will displace the water downward from the top of the vial. Once a measurable headspace forms, you have successfully manufactured and captured clean, breathable oxygen gas from water and light.
- • A distinct pocket of clear gas displaces the water at the top of the inverted tube
- • Continuous micro-bubble trails actively rising from the funnel nozzle into the chamber
- • Bumping or jostling the apparatus, which dislodges the test tube from the funnel
- • Allowing the ambient room temperature to drop below 65°F (18°C), slowing plant output
Credit: inspired by an original tutorial by LouisAyy — watch the original on YouTube.
Don’t have everything?
- No Glass funnel? Cut top section of a clear plastic water bottle
- No Test tube? Small clear glass spice bottle or narrow transparent medicine vial
- No LED grow lamp? Bright desktop lamp with a cool-white LED bulb or direct sunlight
- No Elodea or Hornwort? Fresh Cabomba, Anacharis, or vibrant aquarium moss