THE SUITABILITY OF WATER PURIFIED BY SYNTHETIC ION-EXCHANGE RESINS FOR THE GROWING OF PLANTS IN CONTROLLED NUTRIENT CULTURES

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Abstract
The results of expts. to determine the suitability, for plant growth, of water purified by passage through synthetic ion-exchange resins, show that water of high quality can be obtained. Objectionable traces of Cu and other heavy metals can be removed from distilled water by passage through a hydrogen-saturated cation-exchange resin. The purity of the water is increased by repeated passages through this resin. Water comparable in quality to distilled water, except for silica content, can be prepd. from ordinary tap water by passage through both cation- and anion-exchange resins. This water was found to be suitable for use in plant nutritional studies. The cost of purifying our local tap water with equipment having a capacity of 300 gallons an hour, not considering the original investment, is estimated at somewhat less than 0.1 cent a gallon.

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