[denny]

From BSG's manual. 

The stuff has limited thermal stability, and as it has no effect on hot wort but only on the chilled wort, you want to add it late.  Just long enough in the hot wort to hydrate, late enough for the majority to survive into the chilled wort.  If including a whirlpool stand, consider adding it there.

(Whirlfloc G is a semi refined product as described below.)

Damn, I learned something new today!  That is what I love about this forum!

Goose, years ago there was so much confusion about dosage and timing, I did the unthinkable...I actually contacted the company!  They told me that 1 tab was good for 12 gal. and that it should go in 5 min. from end of boil.

[Robert]

From BSG's manual. 

The stuff has limited thermal stability, and as it has no effect on hot wort but only on the chilled wort, you want to add it late.  Just long enough in the hot wort to hydrate, late enough for the majority to survive into the chilled wort.  If including a whirlpool stand, consider adding it there.

(Whirlfloc G is a semi refined product as described below.)

Damn, I learned something new today!  That is what I love about this forum!

Goose, years ago there was so much confusion about dosage and timing, I did the unthinkable...I actually contacted the company!  They told me that 1 tab was good for 12 gal. and that it should go in 5 min. from end of boil.

Since regular, plain, old fashioned Irish moss flakes need to be rehydrated overnight and added at 15 minutes, I expect that's where 15 minutes got stuck in our heads.  Good to have corroboration from the horse's mouth on the 5 minute timing on tablets!

[denny]

From BSG's manual. 

The stuff has limited thermal stability, and as it has no effect on hot wort but only on the chilled wort, you want to add it late.  Just long enough in the hot wort to hydrate, late enough for the majority to survive into the chilled wort.  If including a whirlpool stand, consider adding it there.

(Whirlfloc G is a semi refined product as described below.)

Damn, I learned something new today!  That is what I love about this forum!

Goose, years ago there was so much confusion about dosage and timing, I did the unthinkable...I actually contacted the company!  They told me that 1 tab was good for 12 gal. and that it should go in 5 min. from end of boil.

Since regular, plain, old fashioned Irish moss flakes need to be rehydrated overnight and added at 15 minutes, I expect that's where 15 minutes got stuck in our heads.  Good to have corroboration from the horse's mouth on the 5 minute timing on tablets!

I always started rehydrating at the beginning of the brew session.  I could never really tell id rehydrating did any good, so I figured that was close enough!  And yeah on the 15 min.  I suspect that the recommendation for that came from IM.

[tommymorris]

From BSG's manual. 

The stuff has limited thermal stability, and as it has no effect on hot wort but only on the chilled wort, you want to add it late.  Just long enough in the hot wort to hydrate, late enough for the majority to survive into the chilled wort.  If including a whirlpool stand, consider adding it there.

(Whirlfloc G is a semi refined product as described below.)

Damn, I learned something new today!  That is what I love about this forum!

Goose, years ago there was so much confusion about dosage and timing, I did the unthinkable...I actually contacted the company!  They told me that 1 tab was good for 12 gal. and that it should go in 5 min. from end of boil.

Since regular, plain, old fashioned Irish moss flakes need to be rehydrated overnight and added at 15 minutes, I expect that's where 15 minutes got stuck in our heads.  Good to have corroboration from the horse's mouth on the 5 minute timing on tablets!

I always started rehydrating at the beginning of the brew session.  I could never really tell id rehydrating did any good, so I figured that was close enough!  And yeah on the 15 min.  I suspect that the recommendation for that came from IM.

I just put the IM in one of my hop baskets in the Picobrew dry. Seems to work fine. My wort and beer are clear.

[brewthru]

Not panicking. I do appreciate all the replies and those taking the time to reply. It's just one of those things. If really not needed then why are we doing? IMO, very similar to dental x-rays. Yes, I know, this is a homebrew forum and I'm not trying to go off topic, but just giving a similar example. X-rays never leave our body. What does this mean? We don't know. How many dental x-rays, and other x-rays, have we had in our life time? Too many to remember. Are these harmful? Don't know. Is the continual use of Irish moss harmful? Don't know.

[tommymorris]

Not panicking. I do appreciate all the replies and those taking the time to reply. It's just one of those things. If really not needed then why are we doing? IMO, very similar to dental x-rays. Yes, I know, this is a homebrew forum and I'm not trying to go off topic, but just giving a similar example. X-rays never leave our body. What does this mean? We don't know. How many dental x-rays, and other x-rays, have we had in our life time? Too many to remember. Are these harmful? Don't know. Is the continual use of Irish moss harmful? Don't know.

Is the continual use of alcohol harmful?

[narvin]

We actually do know that repeated x-ray exposure at enough dosage is harmful and can cause cancer.  There is no real research about carageenan.  Do whatever you want, I won't judge, but I will say (loudly) that this stuff is bunk science, as is most internet based clickbait.

[Robert]

We actually do know that repeated x-ray exposure at enough dosage is harmful and can cause cancer.  There is no real research about carageenan.  Do whatever you want, I won't judge, but I will say (loudly) that this stuff is bunk science, as is most internet based clickbait.

[Black Lion Homebrewery]

Not panicking. I do appreciate all the replies and those taking the time to reply. It's just one of those things. If really not needed then why are we doing? IMO, very similar to dental x-rays. Yes, I know, this is a homebrew forum and I'm not trying to go off topic, but just giving a similar example. X-rays never leave our body. What does this mean? We don't know. How many dental x-rays, and other x-rays, have we had in our life time? Too many to remember. Are these harmful? Don't know. Is the continual use of Irish moss harmful? Don't know.

Well that's just false...x-rays pass through soft tissues, they're blocked by bone and other dense tissues.   Healthline is a media company and has no obligation to verify information before published.  Medical and scientific information should be verified from reliable sites. 

[fredthecat]

if i couldnt use whirfloc tabs, i would enjoy homebrewing a LOT less. there has been one or two times ever when i didn't use it and both times it was incredibly obvious that i didn't in a negative way. ugg