I have been told that a calf bolus known as sustain iii can be used and is now used for Coccidia treatment. You take a sustain iii calf bolus and cut it in quarters. Give one quarter of a tablet and that it is time released so you don’t do the 5 days as with Corrid. I wish (hoping) that will be the case. Please let me here your pros and cons. My Corrid liquid I used last time, it must have been too weak of a mixing on my part. He fail the fecal exam again 10 days after completion of 5 days. I am using the powder this round. I would like to use sustain iii.