Hydroponic nutrient management begins with the water already entering the reservoir. Source water can contain dissolved minerals or other characteristics that affect nutrient preparation and pH management.
Testing gives the designer and grower a more reliable starting point than assuming every borewell, municipal source or spring behaves the same way.
Reservoir cleanliness, temperature management, circulation and monitoring are part of water-quality management after the system is operating.
Use crop-specific nutrient guidance and measured water data rather than copying a universal recipe without adjustment.