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Mod 2 – Lesson 1: Tap Water and Its Implications

Cartier April 24, 2024

Lesson 1: Tap Water and Its Implications


Objective: Understand the use of tap water in indoor cannabis cultivation, its common characteristics, and how to address potential issues.

Materials Needed:

  • pH meter
  • EC or PPM meter
  • Chlorine test kit
  • City water report (if available)

Lesson Overview:

Tap water is the most accessible type of water for many growers. However, its use comes with several considerations that can impact the health and growth of cannabis plants.

1. Characteristics of Tap Water:

  • Minerals and Hardness: Tap water often contains minerals like calcium and magnesium, which are beneficial but can lead to nutrient imbalances if not monitored.
  • Chlorine and Chloramine: These are commonly used for disinfection. While they make water safe for human consumption, they can harm beneficial bacteria in the soil and plant root systems.
  • pH Levels: Tap water can vary in pH, which may need adjusting for optimal plant growth.

2. Testing Tap Water:

  • Conduct a pH Test: Use a pH meter to determine the pH level of your tap water. Ideal pH levels for cannabis are typically between 5.5 and 6.5.
  • Check for Chlorine and Chloramine: Use a chlorine test kit to assess the levels of these chemicals. If necessary, treat the water to remove them before use.
  • Measure EC/PPM: Understanding the total dissolved solids (TDS) in your tap water will help you manage nutrient supplementation better.

3. Adjusting Tap Water for Cannabis Use:

  • Adjusting pH: If the pH is outside the optimal range, use pH up or down solutions to adjust it.
  • Removing Chlorine and Chloramine: Let the water sit uncovered for 24 hours for chlorine to evaporate or use a water conditioner for immediate results.
  • Softening Hard Water: If water is too hard, consider using a water softener or mixing with RO water to achieve the desired hardness.

4. Practical Exercise:

  • Test and Adjust a Sample of Tap Water:
    • Measure the pH and EC/PPM of your tap water.
    • Adjust the pH to fall within the ideal range for cannabis.
    • Test for chlorine and treat if necessary.

Conclusion: Using tap water requires understanding its properties and how they affect plant health. Proper testing and adjustment can make tap water a viable option for cannabis cultivation.

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