Here’s the note I received from MJ:
“Hi Dwain,
Thank you for getting in touch.
The difference is the ease of use of the person doing the pitching. One packet is suitable for a low sg five gal batch, and many mid-range sg five gal batches even if it is a little low on the cell count, therefore if we did 15g packets then many people will use 2/3 of a packet which we really wouldn’t recommend. So we expect more experienced homebrewers to use:
Pitching rate = 1 million cells x ml of wort x degrees Plato of wort
Kind Regards
Kim”
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Their “1 million” vs Mr Malty’s .75 Ale and 1.5 Lager are still off. I think I’ll go with Mr Malty.
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I have double checked our cell counts with MrMalty many times and, as I said, always surprised how close together the results are. I would recommend it for any homebrewer.