Fig 1. Drinking Water Distribution System (DWDS) simulation pipe facility and Pennine Water Group (PWG) Coupon.
A) Test facility, total volume (tank and loops) 4.5 m3, tank volume 1.53 m3, MV = Manual valves used to separate the three loops, 1a, 2a and 3a indicate the 5th coil of each loop into which PWG coupons were inserted, 1b, 2b and 3b indicate the 50 mm internal diameter pipes containing flow meters (FM) and control valves; B) Detail of loop arrangement, T = turbidity meter, CV = control valve, other annotations as for A); C) Coupons secured in the apertures; D) HDPE PWG coupon and rubber gasket, to ensure a watertight fit; E) PWG coupon components (insert for microscopy and outer coupon for molecular analyses) and dimensions.