Synthetic groundwater microcosm experiments inoculated with UKGEOS Glasgow soil microorganisms measuring the biodegradation of the biocide glutaraldehyde in the presence of salt, guar gum, and polyacrylamide. Samples and data are derived from the UK Geoenergy Observatories Programme funded by the UKRI Natural Environment Research Council and delivered by the British Geological Survey. NERC grant SHAPE-UK NE/R018006/1. Samples SSK111458, SSK111459. Core Sore Visit IDA number 271576.