The purification of water and nutrient salts in hydroponics is very important because of the following reasons:
1. Impure water contains impurities, which will interfere in the growth of plant and make the study for the essntiality difficult.
2. Impurities may be toxic to the plant.
3. Impurities may compete with other minerals.
4. Impurities may inhibit some enzymes.
Therefore, only pure water and nutrients should be taken for hydroponics.