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How Often Do You Fill a 100-Gallon Hydroponic Reservoir?

A hydroponic system needs plenty of water in its reservoir. If the reservoir goes dry, the entire system will fail and all the hydroponic plants will die. How often a 100-gallon hydroponic reservoir needs to be filled depends on the hydroponic system's type and size, the environment's dryness, the kind of plants in the system and those plants' water requirements. A good goal is to have 3/4 to 1 gallon of water per plant in the reservoir.

  1. Perform Regular Checks

    • The best way to ensure your 100-gallon reservoir has enough water in it is to do a visual check of it on a regular basis. If you have a large hydroponic system, grow crops that use a lot of water or have the system in a very dry environment, then check the water every one or two days. If you have a smaller hydroponic system, grow plants that don't produce fruits or have the system in a humid environment, then check the reservoir once or twice each week. If the water level is down to or near the "Fill" line, then add enough plain water to bring it back up to the "Full" mark.

    Do Routine Maintenance

    • Because the plants in a hydroponic system use nutrients at varying rates, depending on the plants' number and their stage of growth, the nutrients in the reservoir should be drained and replaced every seven to 14 days. In some types of systems, such as the raft garden, you may be able to go longer between nutrient changes. Discard the old solution, rinse the reservoir and refill it with fresh nutrients. Don’t reuse the old nutrient solution past that point because doing so can lead to an imbalance of nutrients and result in the death of your plants.

    Top off the Reservoir

    • If the nutrient level is low in the reservoir between routine changes, then top it off with plain water to keep your system running smoothly. Don’t add new nutrient solution to old nutrient solution; always top off your hydroponic reservoir with plain water. It helps the system maintain the correct chemical balance and keeps plants in good condition. After you’ve added 50 gallons of fresh water to the nutrient reservoir, it’s time to replace the nutrient solution completely to ensure your plants continue to receive the nutrients they need.

    Keep it Clean

    • If your 100-gallon hydroponic reservoir has a lot of algae or the liquid in it has a bad odor or looks bad, then take it as a sign that something is wrong. Draining the reservoir and discarding the old liquid should remedy the problem. Clean the reservoir with a 10-percent bleach solution, made by mixing one part bleach with nine parts plain water. Run the pumps with the 10-percent bleach solution to get bacteria out of the hoses and other parts of the system. Rinse everything well with water, and then run the pump again with plain water to rinse the reservoir and the system components. Drain the water, and refill the reservoir with fresh nutrient solution.

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