Originally Posted by Skipstr21
They work immediately. I use a little less than half a tab crushed and added to the 8 or so gallons that I start with for a 5.5 gal batch.
Now for the reason:
I use a gravity fed system with my HLT at the top of the food chain. Not having a pump I need to add water to the HLT using a sight gauge for measuring.
I brew in Wisconsin's winter. Rather than having to prepare nine gallons of water and then heat it all at once and take forever to get needed temperatures, I would rather heat 16.5 quarts, send it to the mash tun while I am heating 3.X gallons of sparge water. Then finish off with the second equal sparge of 3.X gallons.
This allows me to add a proper proportion of Camden tabs to the water at various stages of the mash/sparge process. And at each stage I am heating less volumes of water which will save time.