PRE-TREATMENT WITH HYDROPHOBIC POLYPROPYLENE FILTER CARTRIDGES
INTRODUCTION
The hydrophobic polypropylene media is 100% pure polypropylene which provides maximum chemical compatibility, performance and economy in controlling contaminants in critical processes. Its pure media is made by a proprietary process which produces a highly porous structure that is NATURALLY HYDROPHOBIC. This means that it:

• Repels moisture and water
• Has excellent petroleum base, hydrocarbon and solvent resistant characteristics
• Will not lose its hydrophobicity while in use
• Is a natural barrier to water without the use of additives or surface modifying agents which can leach or wash out

HYDROPHILIC:
Has an affinity for water and attracts it strongly. A hydrophilic filter can be wetted with virtually any liquid.

HYDROPHOBIC:
Repels water. Hydrophobic filters cannot be wetted by aqueous solutions or by liquids with high surface tensions without first prewetting with agents of low surface tension such as alcohol, or by subjecting it to high pressure. Hydrophobic filters are best suited for hydrocarbons.