In hydroponics, a reservoir is the container that holds the mixed nutrient solution and supplies it to plant roots. It is the central hub of any recirculating hydroponic system β nutrient solution flows from the reservoir to the plants, then drains back for recirculation. Reservoir design, size, and management directly affect pH stability, nutrient concentration, dissolved oxygen levels, and the risk of pathogen outbreaks.
Key Facts
- Size: larger reservoirs buffer pH and EC fluctuations better; minimum 20 L for small systems
- Light-proof reservoirs prevent algae growth β use opaque containers or block all light
- Keep reservoir temperature at 18β22Β°C (65β72Β°F) to maintain dissolved oxygen and suppress pathogens
- Top up with plain water (not full nutrient solution) when solution level drops β plants drink more water than nutrients
- Full reservoir changes every 7β14 days maintain nutrient balance and hygiene
- Monitor pH and EC daily; large daily swings indicate plants are actively feeding