Flow cytometry can now be officially used for the quantification of microbial cells in drinking water. The new analytical method provides much more realistic results than the conventional method, in which bacterial colonies are grown on agar plates.
Pretty much mirrors phage practicals we used to do in MCB here at UCT: tap water was always cleaner in terms of coliphages than bottled mineral water. I’d still go with phages over flow cytometry, though: it was exquisitely sensitive, and a LOT cheaper.
See on www.sciencedaily.com