For cannabis, a well-optimized reservoir setup is essential for robust growth, especially when using organic ferments. Proper oxygenation and mixing ensure both nutrient stability and root health, while frequent cleaning prevents biofilm and microbial overload.

Reservoir Oxygenation Essentials

• Air Bubbler (Air Stone): Use a high-output air pump attached to fine-pore air stones. Fine bubbles dissolve easier, raising dissolved oxygen levels for roots and beneficial aerobic microbes.
• Submersible Pump for Mixing: A submersible circulation pump keeps nutrients and organics from settling, evenly distributing ferments and preventing anaerobic zones.
• Reservoir Placement: Position air stones at the reservoir bottom and submersible pump midway or opposite for full circulation. Avoid excessive turbulence, which may stress roots if running in recirculating systems.

Monitoring and Temperature

• Dissolved Oxygen (DO) Goal: Target at least 6-8 mg/L DO during veg and 5-7 mg/L DO in bloom for cannabis. Use a DO meter for accuracy, especially with ferments that deplete oxygen.
• Water Temperature: Keep reservoir temps between 65–72°F (18–22°C) for maximum oxygen solubility and root function. Warmer temps = less oxygen; consider a chiller if needed.

Cleaning & Maintenance When Using Ferments

• Why Clean More Often? Ferments (FPJ, FFJ, LABs) add active microbes and organic acids that can accelerate biofilm, clog pumps/lines, and increase the risk of anaerobic pockets.
• How Often to Clean: Fully drain and clean out reservoir and all lines with a mild (food-safe) peroxide or vinegar solution at least every 7 days when running ferments. For high-microbial loads or warmer environments, clean every 3-5 days.
• Signs to Watch: Any floating films, sour or rotten odor, bubbly scum, or visible sediment are signs to clean immediately.