<p>A) Test facility, total volume (tank and loops) 4.5 m<sup>3</sup>, tank volume 1.53 m<sup>3</sup>, MV = Manual valves used to separate the three loops, 1a, 2a and 3a indicate the 5<sup>th</sup> 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.</p
