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- Size: larger reservoirs buffer pH and EC fluctuations better; minimum 20 L for small systems
- Light-proof reservoirs prevent algae growth â use opaque containers or block all light
- Keep reservoir temperature at 18â22°C (65â72°F) to maintain dissolved oxygen and suppress pathogens
- Top up with plain water (not full nutrient solution) when solution level drops â plants drink more water than nutrients
- Full reservoir changes every 7â14 days maintain nutrient balance and hygiene
- Monitor pH and EC daily; large daily swings indicate plants are actively feeding