The bubble method of water purification B. M. Smirnov, N. Yu. Babaeva, G. V. Naidis, V. A. Panov, A. S. Saveliev, E. E. Son and D. V. Tereshonok EPL, 121 4 (2018) 48007 Published online: 20 April 2018 DOI: 10.1209/0295-5075/121/48007