What is the contaminant?

Thanks IFRs.  Fuel's contaminated with water even after passing filtration.

What is your specification for water, 100ppm?

How you produce your JF?

Do you produce it or are you buying it?  Where is the jet fuel coming from?  

How is it being stored before you test it?

How long is it being stored before you test it?

What kind of tank is it stored in?

Is it a floating roof tank?

Where is the tank outlet in relation to the bottom of the tank?

BigInch-born in the trenches.
http://virtualpipeline.spaces.msn.com

Surfactants, natural as naphthenic acid derivatives, or additives such as those of the glycol-type, anti-icing, static dissipators, corrosion inhibitors, added intentionally or picked up in multiproduct pipelines, impair the operation of filters/separators, and tend to retain water droplets in suspension. Microbiological growth has been suspected to give rise to similar troubles.

On the other hand the solubility of water (ppm vol/vol) in wide cut turbo fuel is greater than in kerosine type, approximately as follows:

                ^oC            kero→wide cut

                  0                 28→ 45
                20                 45→ 82
                40                 82→140

Clearly, water solubility drops with a decrease in temperature. At the low temperatures encountered in flight, much of it will form crystals that remain suspended in the fuel due to the aircraft movement, some will settle out.

Dried fuel will reach a water equilibrium in a matter of hours when exposed to the atmosphere. Thus, it is considered impractical to attempt to remove dissolved water by use of refrigeration or dessicants.

If stored in a floating roof tank, is the floating roof full-contact or non-contact type and what is it's condition?