Geoshield^® is the smooth turquoise inner lining of the WASTEFLOW tube that contains the anti–microbial tributyl-tin maleate and a Teflon-like fluoroethylene slip agent*. Geoshield is an anti-microbial. It does not treat the water flowing through the tube.

It has been found to be effective in preventing a slime build–up inside the tube, even with effluent that has very high BOD > 900 mg/l.

Geoshield works on the energy systems of the microbial cell. Geoshield will work as long as the polymeric matrix remains intact because the antimicrobial agent is inherent within the polymeric structure.

There is virtually no discharge of Geoshield into the environment because the active ingredient, TBT–maleate, does not migrate readily through polymeric matrices. One of the major advantages of TBT–maleate over Tributyl Tin Oxide (TBTO) is that TBT–maleate is a solid; whereas, TBTO is a liquid. Therefore the TBT–maleate is a different chemistry with low migratory properties and very low water solubility  Geoshield is only available in the WASTEFLOW product range.

To understand the difference between the Geoshield inorganic compound vs. OBPA arsenic based organic compounds please see the SPE article "Killer Plastics - Antimicrobial additives for polymers"

* Patent pending