[scrap iron]

My LHBS used to have a different Iodine sanitizer, can't remember the brand, but now carries 5-star brand IO-star. The old brand had instructions for 12.5 ppm and 25 ppm Iodine solution. The new IO-star brand has instructions for 25 and 50ppm. I used to mix up the 12.5ppm solution for my kegs and never had a problem. So my question is what is the right mixture with the IO-star with out wasting excess sanitizer?

[BrewBama]

Based on conversations with a company rep hosted here a while back, I use 1/2 ounce (14.7 ml) concentrate per 5 gallons of cold water; 1/4 ounce (7.39 ml) concentrate per 2.5 gallons of cold water; 1 tsp (4.92 ml) per 1.5 gallons of cold water.


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[scrap iron]

Thanks Brewbama, sounds like that matches up with what I used to use with the old sanitizer at 12.5 ppm. 1/2 oz or 3 tsp for 5 gals. The IO-star has 1 oz or 6 tsp for 5 gals equals 25 ppm. The tsp measurement is not on the label but I Googled it.

[KellerBrauer]

On the subject of IO San, I circulate 2 ounces of this sanitizer in 10 gallons of hot water throughout the cold side of my brewery on brew day.  When I start the process, the water is a reddish orange color.  However, after about 20 minutes, the water eventually turns clear.  Why is that and is the sanitizer still working at that point?

[BrewBama]

The hot water drives off the iodine gas.  The mfr specifically calls for cold water. The hotter the water, the faster the Iodine will gas into the atmosphere.


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[goose]

The hot water drives off the iodine gas.  The mfr specifically calls for cold water. The hotter the water, the faster the Iodine will gas into the atmosphere.


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It will do the same if you store it mixed in a keg even if cold but it will take maybe a couple days for it to gas off.  I learned this a long time ago from a past experience.

[KellerBrauer]

The hot water drives off the iodine gas.  The mfr specifically calls for cold water. The hotter the water, the faster the Iodine will gas into the atmosphere.


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It will do the same if you store it mixed in a keg even if cold but it will take maybe a couple days for it to gas off.  I learned this a long time ago from a past experience.

That's great to know!  Thank you!!

[a10t2]

It will do the same if you store it mixed in a keg even if cold but it will take maybe a couple days for it to gas off.  I learned this a long time ago from a past experience.

The exception is if the keg (or whatever vessel) is sealed, then there's no place for the gas to go and it will come to equilibrium pretty quickly.

[fredthecat]

I prefer iodine over starsan, I think its 99.9% rather than 99% and nicer to deal with other than discolouring plastics.

I use 1.25ml / 1 litre of tap water.

Starsan is annoying because it gets milky strings in it if you use tap water that isn't very low in minerals and let it sit a day or two.