[morticaixavier]

Good to know though they take longer than 5 minutes to dissolve.

The ones I get seem to dissolve in a few seconds.

Mine fizz and take about ten minutes to dissolve.

euge, are you sure that's whirlfloc and not alkaseltzer? 

[a10t2]

Manufacturer recommends 5 m in. before the end of boil.  One tab is good for 12 gal., so 1/2 tab is fine for a 5 gal. batch.  There's a lot of confusion about this because so many retailers repackage Whirlfloc with inaccurate instructions.

I doubt it really makes a difference, but Kerry's packaging recommends 10 min for Whirlfloc T and 15-20 min for Whirlfloc BWS. http://crosby-baker.com/index.php/processing-aids/kettle-coagulants.html

The BWS is horrible stuff to work with, BTW. Well worth the small premium for the tablets.

[denny]

Good to know though they take longer than 5 minutes to dissolve.

Wow, you must have some tough Whirfloc!  When I add 1/2 tab it dissolves almost instantly.

[denny]

I always throw it in at 15 and it seems to work fine

Might very well work fine, but the company line is that it starts to denature and become less effective after 5 min.

[denny]

Manufacturer recommends 5 m in. before the end of boil.  One tab is good for 12 gal., so 1/2 tab is fine for a 5 gal. batch.  There's a lot of confusion about this because so many retailers repackage Whirlfloc with inaccurate instructions.

I doubt it really makes a difference, but Kerry's packaging recommends 10 min for Whirlfloc T and 15-20 min for Whirlfloc BWS. http://crosby-baker.com/index.php/processing-aids/kettle-coagulants.html

The BWS is horrible stuff to work with, BTW. Well worth the small premium for the tablets.

Thanks, Sean!

[theDarkSide]

Good to know though they take longer than 5 minutes to dissolve.

Wow, you must have some tough Whirfloc!  When I add 1/2 tab it dissolves almost instantly.

I add mine at 10 minutes and I crush it with the back of a spoon before adding it.  And yes, it does fizz when you add it.  I always imagine I'm making some potion and this is the ingredient that goes "poof" and makes the skull and crossbones appear above the kettle like in the Bugs Bunny cartoons.