1. Operational and Experimental Results of Direct Filtration;Hutchison;Jour. AWWA,1974
2. Direct-Filtration Studies for Metropolitan Toronto;Tredgett;Jour. AWWA,1974
3. Hutchison , W. R. Operational Variables and Limitations of Direct Filtration Ontario Min. of the Envir., Pollution Cont. Bd., Water Tech. Sect., Res. Rprt. W54 Ontario, Canada. 1975
4. Harris , R. H. Control of Filter Aids in High Rate Filters Using Turbidity Monitoring Presented at AWWA Conf. Denver, Colo. 1971
5. Lambton Water Plant Uses High-Rate Direct Filtration Wtr. and Pollution Cont. 16 1975