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Can I use water from the dehumidifier?

Cannabis cultivation is a rewarding hobby for many, and it requires careful attention to various factors like light, temperature, humidity, and, of course, water quality. In this article, we will explore whether water collected from a dehumidifier is suitable for growing cannabis plants.

Understanding Dehumidifier Water​

A dehumidifier works by removing excess moisture from the air, effectively reducing the humidity level inside a room. The water collected by the dehumidifier is called condensate, which is essentially distilled water as it is obtained through the process of condensation.

Water Quality Concerns​

While condensate water is generally considered clean and safe for many applications, there are some concerns about using it for growing cannabis plants. These concerns stem from the fact that dehumidifier water can potentially contain contaminants, such as:

  1. Bacteria and mold: The moist environment inside a dehumidifier can promote the growth of bacteria and mold. These microorganisms can contaminate the water and harm your cannabis plants when used for watering.
  2. Heavy metals: Some dehumidifiers may contain materials that release heavy metals like lead or chromium into the water. These toxic elements can accumulate in your cannabis plants and cause negative effects on their growth and quality.
  3. Chemical contaminants: Dehumidifiers can also release chemical contaminants, such as volatile organic compounds (VOCs) and refrigerants, which can dissolve in the water and negatively affect your plants.

Potential Benefits of Dehumidifier Water​

Despite these concerns, there are some potential benefits of using dehumidifier water for growing cannabis:

  1. Water conservation: Utilizing dehumidifier water can help you save water resources by recycling the moisture from the air.
  2. Lower pH: Dehumidifier water often has a lower pH, which some cannabis growers find favorable for their plants. This depends on the specific pH requirements of the cannabis strain you are growing.

Precautions to Take​

If you decide to use dehumidifier water for your cannabis plants, here are some precautions you should take to ensure its safety:

  1. Clean the dehumidifier: Regularly clean and maintain your dehumidifier to minimize the risk of bacteria, mold, and other contaminants. Use a mild bleach solution or a disinfectant specifically designed for dehumidifiers.
  2. Test the water: Before using the dehumidifier water, test it for contaminants such as heavy metals, bacteria, and mold. You can use a water testing kit or consult a professional service.
  3. Monitor plant health: Keep a close eye on your cannabis plants for any signs of nutrient deficiencies or other health issues that could be related to the water quality.

Alternatives to Dehumidifier Water​

If you prefer not to use dehumidifier water for growing cannabis, there are other water sources you can consider:

  1. Tap water: If the tap water in your area is of good quality, you can use it for watering your plants. However, you may need to adjust its pH and remove chlorine by letting it sit for 24 hours before use.
  2. Reverse osmosis (RO) water: RO water is a popular choice among cannabis growers because it is free of contaminants and has a neutral pH. However, RO systems can be expensive to install and maintain.
  3. Rainwater: Collecting rainwater can be an eco-friendly alternative to using dehumidifier water. Be sure to filter and test it before use.


In conclusion, while it is possible to use water from a dehumidifier for growing cannabis, it is essential to weigh the potential risks and benefits carefully. By taking the necessary precautions and considering alternative water sources, you can ensure the health and success of your cannabis plants.
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