Water is one of the most important things growing cannabis. Plants mostly need light, substrate and water. To get the best yields is important to use the best quality in every one of these aspects.
Water Quality
Hard water
The concentration of calcium (Ca) and magnesium (Mg) indicating the hardness of the water. Water containing between 100 and 150 milligrams of calcium (CaCO3) per liter of culture pot is acceptable.Freshwater contains less than 50 milligrams of calcium per liter and should be supplemented with calcium and magnesium.
Sodium chloride and water quality
Water with high levels of chlorides usually contain high levels of sodium often, but the reverse is not true. Water with high levels of sodium, does not necessarily contain high levels of chloride (chlorine).
At low levels, sodium appears to increase the performance, perhaps by acting as a partial substitute compensates potassium deficiency. But too much sodium is toxic and causes nutrient deficiencies include: potassium, calcium and magnesium.
Chlorine is essential to the use of oxygen during photosynthesis, and is necessary for cell division in roots and leaves. Chlorine is vital to increase the osmotic pressure regulation to modify and improve the stomata of plant tissue and moisture. a concentration less than 140 parts per million (ppm) in the nutrient solution is generally safe for marijuana, but some varieties may be susceptible to these levels, which can be seen in the foliage becomes pale green fades. The excess chlorine causes the tips and edges of leaves are burned, and causes the blades to turn a tan color.
Simple water filters do not clean dissolved solids from the water. These filters remove only emulsified waste (manure) in water free of dissolved solids chemical bond is more complex. A machine uses reverse osmosis semi-permeable membranes which allow small polymer pure water filtered and the solids dissolved. Osmosis machines are the easiest and most effective way to clean running water.
Osmosis
Displacement of roots per plant nutrient solution by osmosis. The osmosises the tendency of fluids to pass through a semi-permeable membrane and mixed together to achieve the same concentration of both sides of the membrane. The semipermeable membrane in the hair root nutrients localian allow specific access dissolved in water to the plant, while nutrients and other impurities are excluded. Such as salts and sugars are concentrated in the roots, electrical conductivity (EC) in the roots is (almost) always higher than outside the estate. The transport of nutrients by osmosis works because it depends on the relative concentrations of each nutrient on each side of the membrane, and depends on the total dissolved solids (TDS) or EC solution.
For elements that are absorbed by the roots by osmosis, the concentration of the various elements must be greater than inside the roots.
However, the transport of water (no nutrients) through the semi-permeable membrane depends Eq For example, if Ec is the highest outside of the roots in their midst, dehydrated plants by making the water is through the roots. In other words: salt water with high Ec can dehydrate plants.
Reverse osmosis filters
Reverse osmosis machines are used to separate dissolved solids in water. These machines are moved from the solvent (water) through the semi-permeable membrane, but the process is reversed. It has a low to high concentration. The method is performed by applying pressure to the contaminated water in which only pure water is forced to pass through the membrane. The water is not completely pure, Ec 0, but most of the dissolved solids are removed.
The efficiency of the reverse osmosis membrane depends on the type and chemical composition of the dissolved solids in the water.
Unfortunately, tap water often contains high levels of sodium (Na), calcium (Ca), alkaline salts, sulfur (S) and chlorine (Cl). The pH may be different than acceptable (6.0-7.0). Water containing sulfur is easily distinguished by taste and smell. Water is usually coastal saline due to infiltration of salt because of the sea
Bibliography: Marijuana Horticulture: The cannabis (Jorge Cervantes)