Ask Mr Wizard Understanding Pitching Rates Q I'm trying to make sense of BYO's latest article on yeast pitching rates and correlate it with yeast suppliers' data. The rule of thumb is 1 million cells/ milliliter/°Plato. I get that. However, when I go to Wyeast Labs (www.wyeast.com), they not only reference this formula, but also indicate the following interesting points about their Activator product: 1. Each package contains >100 billion yeast cells 2. Each package is designed to successfully ferment 5 gallons of wort with an SG ≤1.060 (or 15 °P) When you apply the rule of thumb to the second bullet above, you are led to believe that each smack pack contains 280 billion cells (not 100). Are they not following the very rule of thumb they recommend? I suppose 280 billion is greater than 100 billion, but do I really want to purchase a product that is only guaranteed to have ~1⁄3 of the yeast cells I need for my 1.060 wort? A Wizard responds: I went to the Wyeast Web site to do a little bit of recon before answering this question. I found the site very informative and did see much of the information described in your question. What I could not find was any reference to the general rule you cite in your question. However, there is a chart on pitching rate that you may find very useful. Read More |
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