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marijuana grow water ph

Marijuana grow water ph

Usually a household osmosis filter is sufficient to clean water from common impurities such as calcium, magnesium, and low levels of salts. The cost of 100,-$/Euro is worth the investment and cheaper than buying bottled mineral water. An osmosis filter system can last a lifetime and you only need to exchange the filters every once in a while. An osmosis filter is essential if your water has a high EC . Generally an EC above 0.7 is problematic, especially if you need to fertilize indoor or have a hydroponic system. Mixing your water approx. 50-50 with pure osmosis water solves this problem.

*Vinegar is a neutral acid that is completely harmless to plants when diluted in water. It can be used for Hydrofarms with hydro correls and on rockwool. Not all growing mediums may be suitable. run a test if you are using coco coir or other substrates.


Photo: a typical household osmosis filter can be attached to any water faucet in your home or garden. The best buy is a 3-chamber system which contains three filters that can be replaced at relatively low cost.


Photo: yellowing, leaf curl, circular burnt spots on leaves, and leaf drop are typical symptoms from water with a high level of sodium.

In the world of plants each plant species is perfectly adapted to a certain pH range of the soil or water. Hobby gardeners are usually familiar with the different pH requirements of various plants like rhododendron, roses, or conifers, and buy special soil mixes and regulate the pH of water appropriately.

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For a general assessment of your water quality test the pH and EC range with your essential kit. Also look at the colour of the water and if it has any strong smell. If you notice anything out of the ordinary you can give a 1L sample to the pharmacy for a chemical analysis. The pharmacy sells sterile bottles for this purpose. The analysis usually costs 50-60$/Euro and provides details of common harmful contaminants. This is especially recommended for testing well water. It helps to say that you need an analysis for drinking use and watering plants so that specific contaminants are tested for. If you need to install an osmosis filter for heavily polluted water you will need this analysis to purchase the correct osmosis system and filters.

Photo: this is a standard colour chart for a liquid pH tester. The optimum pH range of water for cannabis cultivation in soil is a light green colour that indicates pH 6.2-6.5

The ideal pH and pH fluctuation in hydroponics depends on several factors that you have to evaluate on an individual basis because each hydroponic system is different due to the following:

Marijuana grow water ph

You don’t need to be exact, just keep an eye on things and react if you notice the pH is getting too high or too low

If you don’t get all these extra items, you won’t be able to take the best care of your digital pH tester and it won’t give you accurate pH readings and they won’t last nearly as long.

See which nutrients are best absorbed at which pH levels