REX-BI7 is a glutaraldehyde based material which is widely used in the industry as  a biocide to deal with SRBs (sulphur reducing bacteria) which are serious causes of corrosion. This material is largely made redundant in systems utilising REX-SU1(See  under Surfactants above) because the conditions which are congenial to SRBs are eliminated by REX-SU1. However REX-SU1 has no biocidal properties, so REX-BI7 might prove to be a necessary precursor to an application.

REX-BI7