I guess it depends on what system,,,
FYI:Hydroponics - Wikipedia, the free encyclopedia
The main advantage of the NFT system over other forms of hydroponics is that the ... offers growers the ability to reduce the spread of disease and pathogens. .... Perlite has similar properties and uses to vermiculite but generally holds .... "Alfalfa Sprouts Source Of Salmonella, Experts Say - Omaha- msnbc.com". ...
en.wikipedia.org/wiki/Hydroponics - Cached - Similar
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Salmonella
However, as with all things, there are disadvantages and primary among those is that the hydroponic conditions (presence of fertilizer and high humidity) have been said to create an environment that stimulates salmonella growth.
Chintamanie, in response to how this advantage is addressed, maintained that the stimulation of salmonella is not an issue for Guyana since the hydroponic conditions here are different.
“We use the paddy husk and white sand. This is different from conditions seen with hydroponic setups in other places. Salmonella is not something we have to worry about,” he affirmed.
For the complete article go to
http://www.guyanachronicleonline.com...ries&Itemid=17
Do you have a source for that article? web site?
Thanks
Simon