An alternate system runs on the fog or great mist injected in to the intake air stream. Although many commercial systems can be found, growers can assemble and set up their own system utilizing a high pressure piston pump and fog nozzles. The essential components are demonstrated in Fig. 1. A two-stage system managed by a two- stage thermostat enables more water to be employed on excessively warm, shiny days. Temperature settings should be 5-10°F apart.
Algae growth in the pads can become a problem that will decrease the effectiveness of the machine and lead to accelerated deterioration of the pads. The addition of an algaecide to the water supply will help in control.
It is desirable, especially in hard water areas, to add a wetting agent to the drinking water to obtain more uniform wetting of the pads. A commercial material or liquid household detergent at the rate of 2 tablespoons per 100 gallons may be used.
Water for the pads should be clean and lower 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 per minute per linear foot of pad program ought to be provided to assure adequate wetting.
In the most common coolant system (fan and pad), the fans draw air Greenhouse Exhaust Fan through wet pads that prolong the length of 1 endwall or sidewall. Aspen and coated cellulose are common pad materials that always have life of 1 to three years. Approximately one square foot of pad are is needed for 20 square ft of floor area.
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