Interestingly, it was found that the use of pesticides was not required in the Seawater Greenhouse, while crops in the comparison greenhouses had to be sprayed for whitefly 7 times during the growing seasons. The reasons for this are not entirely clear, although it was felt that the salt water evaporators had an air scrubbing effect, such that any airborne insects or contaminants were washed out of the incoming ventilation air. A coastal location is a further benefit as the air coming off the sea carries much fewer pests and contaminants.