Seems to me they are fairly interchageable and a preference lies mostly in the one you started with... yes? No?
The only advantage to iodophor is that it is cheaper per ounce, but when you factor in the re usability of star san it is much cheaper in the long run.
1. True, Star san is slippery. But I don't sanitize the outside of my carboy so it doesn't effect carboy handling. The only time this has effected me is getting bungs to stay in...but I switched to carboy caps a lot time ago for this amongst other reasons.Other advantages:
* non-slippery. This is nontrivial when sanitizing glass carboys.
* can used for iodine starch conversion testing
* doesn't generate endless newbie "should I f33r the foam!!??!!!??!" threads
* may be available in monster bulk sizes from dairy/farm supplies
Not being an iodophor partisan (I use both). I do love the thoughtfulness of the squeeze-measure SS bottle, even though I still use a syringe to measure accurately.
2. Unless you can see the foam, it's hard to tell if there is sanitizer in a carboy. Iodophor can be visually checked.
Iodine is a stone cold killer and if it is capable of killing the bacteria on your brew equipment it is also capable of killing the bacteria in your septic tank. Dumping some diluted iodophor down your drain a couple times a year isn't going to ruin your septic but that stuff does build up if you use a lot. Considering that iodophor doesn't last you will have to dump it every time you make it. I know in a lot of places there is even laws against dumping iodine into public sewers...but no one follows those laws anyway.So what does idophor do to septics?
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