In vitro investigations of the impact of different temperature and flow velocity conditions on tufa microfabric - Tufas and Speleothems: Unravelling the Microbial and Physical Controls - page 192

Fig. 2. (a) Calibration of conductivity and calcium hardness in Corallin Calcium Reactor generated flumes water.
(b) Typical biofilm and associated carbonate precipitates developed in the flume experiments after 14 weeks under
summer fast-flow conditions. Note the moss framework aiding the development of a micro-barrage and the trailing