I would say that both the right medicine and good technique are important. You can't brew coffee with sawdust. Also the chemicals influence your technique, eg to rinse or not to rinse. With bleach you have no choice, with Iodophor and phos acid based stuff its your choice.Pat Casey said:But of course the critical factor in sanitation iis what you do rather than the chemicals you use. If you have any respiratory problems give sodium met a miss. The reason it is so commonly used is a hang-over from amateur wine making where it is used for both its anti-oxidiant and as well as its bacterial inhibiting properties - amateur brewers could not really get anything else except bleach.