An alternate system runs on the fog or fine mist injected in to the intake air stream. Although several commercial systems can be found, growers can assemble and set up their own system using a high pressure piston pump and fog nozzles. The basic components are shown in Fig. 1. A two-stage system controlled by a two- stage thermostat allows more water to be employed on excessively warm, bright days. Temperature settings ought to be 5-10°F apart.
Algae growth in the pads can become a problem that may decrease the effectiveness of the machine and result 
in accelerated deterioration of the pads. The addition of an algaecide to the water supply can help in control.
It really is desirable, especially in hard water areas, to add a wetting agent to the water to obtain more uniform wetting of the pads. A commercial materials or liquid home detergent at the rate of 2 tablespoons per 100 gallons can be used.
Drinking water for the pads ought to be clean and low in mineral content to prevent clogging and coating of the pads. A pump, pipes and gutters are accustomed to recirculate the water. A flow rate 113 gallon each and every minute per linear foot of pad system ought to be provided to ensure adequate wetting.
In the most typical coolant system (fan and pad), the fans draw air through wet pads that extend the length of 1 endwall or sidewall. Aspen and covered cellulose are normal pad materials that usually have life of 1 to 3 years. Approximately one sq . foot of pad are is necessary for 20 square feet of floor area.
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