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Does the Water Source for Growing Cannabis Matter?

photo/istock/Vitalij Sova

When questions are raised about the pH level of a nutrient solution for growing cannabis, you should always consider the source. The water source that a cannabis grower uses is the biggest factor for the initial pH stability for your cannabis plant’s life. City tap water is not the best choice that a cannabis grower can make when it comes to pH stability because it’s full chemicals and elements that affect the overall pH level of the final solution. Magnesium and Calcium are just two of the many elements found in poor ratios solutions for tap water which contributes to pH fluctuations. 
 Cannabis growers who use hard water have problems with pH fluctuations due to high levels of magnesium and calcium. In order to get rid of these unwanted chemicals or elements, there are a lot of hydroponic cannabis growers who will use filtration devices like a reverse osmosis system. Reverse osmosis, when done correctly will give a horticulturist 100% pure water with a neutral pH level of seven. 
 There are some other factors like the surrounding environment that the water came from which can cause the pH levels to change over time. When water has a neutral pH level and it’s exposed to air, the pH levels will become acidic as carbon dioxide is absorbed by the water from the surrounding air. This pH fluctuation for cannabis growers is not a big deal and doesn’t require any pH adjustments. 
Cannabis growers who improve their gardens with higher levels of CO2 could experience dramatic decreases in the overall system’s pH levels. The best approach to solve this problem is to remove the holding tank or reservoir from the area that is saturated with high levels of CO2. When the water in the holding tank is not exposed any longer to the high levels of CO2 it becomes safe to recycle through your system. Water for a cannabis plant is like having the fire to smoke your weed.