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Galvanised steel pipe
— Zinc-coated steel pipe used in pre-1960s plumbing, prone to internal corrosion over time.
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Garden flat (basement level)
— Ground or lower ground flat with access to garden, often with pumped drainage.
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Georgian property
— Period property built between 1714 and 1830, often listed and with replaced drainage.
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Geotextile membrane
— Permeable synthetic fabric used to separate granular materials and prevent fines migration.
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Glass-fibre reinforced plastic (GRP)
— Composite drainage pipe of glass fibres in polyester resin, used for large diameter sewers.
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Glass-reinforced liner
— Glass-fibre reinforced CIPP liner for high-strength structural rehabilitation of damaged sewers.
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Grease blockage (food waste)
— Drain blockage caused by accumulated food waste, fats and detergent residues from kitchens.
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Greywater system
— System collecting wastewater from baths and basins for reuse in toilet flushing or irrigation.
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Gully replacement
— Removal and installation of a yard or road gully where the existing unit has failed.
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Gurgling drain
— Bubbling or glugging noise from a drain or fitting caused by air being drawn through traps.
