“Growing plants in water culture”. There are 2 common methods NFT (nutrient film technique) and substrate culture (rock wool); Widely used in the commercial production of salad crops under glass. Water Quality: Good clean water supply required (tap); This is filtered as it circulates and passed through an ultra violet light tube to control pathogens and algae growth.
Pest/Disease Control (water quality/pathogens): As the whole system is very intensive in many ways (for maximum growth) everything is geared up – maximum solution/correct pH/high growing temperature/high light intensity. If anything goes wrong it can quickly spread and the whole crop lost very quickly (a waterborne pathogen can be circulated through the whole crop in a matter of hours). It is usual to use preventative rather than creative measures. Automation of the system is possible.