Recent content by bobz

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    My Stirplate... Cheap and Easy Build...

    The stir plate should be loosely covered for air movement. I use a aquarium pump to provide oxygen to the propagation process inside the flask covered with a sandwich baggy. Bad things fall don't crawl up. I try to stay under the crabtree effect. There is a great deal of understanding to be...
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    Pitching Large Starters

    Swampass, Lagers are done with very powdery yeasts and take a long time to flocculate. The majors want the yeast to stay in suspension and they filter when ready so it is not a problem for them. When I do lagers I set the floc temp about 38F and it clears not completely but enough to get rid of...
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    Pitching Large Starters

    If you grow yeast what are the byproducts and how is aerobic and anaerobic propagation different. Simple answer is don't pitch your starter. Sure you can get away with doing it but why. If your beers go into competition you may get results you won't like. bobz
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    starter question

    A starter is used to grow yeast and in the process all sort of things will develop in the remaining fluid and these are not the best for beer. That is why you should wash your slurry if going to re-pitch. There is practice and good practice why take a shortcut. Don't pitch your starter. There...
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    growing yeast

    The first question I would ask is - do you want to grow yeast or do you want to make ethanol. Do research on aerobic and anaerobic propagation and Crabtree effect. The question is complex but the solution is simple. bobz
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    Can I pitch my yeast yet?

    Chris White has nailed it. This book is a must if you are any kind of brewer. I have made the statement in my talks at several home brew clubs that if you do not have a stir plate you are not a serious brewer. Yeast and fermentation temp control are the most important elements of brewing. It is...
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    Can I pitch my yeast yet?

    The yeast book is excellent reference. My copy was signed at the WBF after the GABF. I wished he had spent more time on aerobic propagation. The starter thing is one of good practice. 99% of the time I use pure cultures and aerobically propagate with a stir plate and air pump into the vessel...
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    Can I pitch my yeast yet?

    To kanzimonson - you have to be kidding - Happy New Year and keep on pitching your starter. bobz
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    Can I pitch my yeast yet?

    I respect your opinion but you are taking a chance. Starters are notorious for off flavors and other things. Pitching starter is not good practice. The complexities of yeast propagation are enormous. I do not want to write a book but reference Dr. Fix and Dr.White and others. Good beer is no...
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    Can I pitch my yeast yet?

    Never ever pitch your starter. Pitch only the slurry. Off flavors and other bad things can happen. bobz
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    Pitching rate/Starter problem

    rjwight, The yeast book explains that the more yeast in-solution the less cell growth you will get. I would chill what you have to flocculate pour off the supernatant split add more starter. Do the same before pitching. Do not pitch the starter solution only the slurry. Bad things can happen...
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    How is starter size calculated?

    I think I will throw some poop in the game. Do you propagate your yeast aerobically or anaerobically, and how do you do it. What is the Crabtree Effect? ---bobz
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    Pitching rate/Starter problem

    Mr Malty is always under pitching. Do your own cell math. 1billion cells per liter per degree Plato for ales - 1.5 billion for lagers. Split your starter into separate vessels and add more wort. As gravity increases cells do no multiply in a linear fashion estimate the amount of cells by the...
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    Long term yeast storage: agar vs. water

    How long does a homebrewer need to store yeast. Sterile distilled water will get you < 2 years depending on your procedure. I pressure cook distilled water in 8ml vials and pipette 2-3 ml in each vial every time I smack a pack or open a liquid culture. stores at room temp. 400x is the...
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    Help with fermentation

    The flavor profile is done. Kick the temp up and give a couple days. bobz