About dry ice...

[Dave Ribeiro]

Ed,

The 25/30 lb. block , will last the longest .... ( but is hardest to use )
The smaller pellets are great but only last 8 -12 hours ... Must be kept
in a sealed cooler, with no leaks ? In shipping packages around the world, we used a block covered over by pellets.... this would last 3-5 days.... Hope this helps.....