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Keeping the temperature as steady as possible for a pure culture ''Lactobacillus'' fermentation is not that important. Just try to stay in the range of the temperature best suited for a given species (see the [[Lactobacillus#Culture_Charts|''Lactobacillus'' culture charts]]). Here are some tips from MTF members on maintaining warm temperatures for wort souring <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1279628395398705/ Tips from many MTF members on maintaining heat for wort souring. 04/07/2016.]</ref><ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1429055690455974/ Tips from many MTF members on maintaining heat for wort souring 2. 10/07/2016.]</ref><ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/1557805380914337/?comment_id=1557821360912739&comment_tracking=%7B%22tn%22%3A%22R7%22%7D Tips from many MTF members on maintaining heat for wort souring 3.]</ref>:
:''Editor's note: please be cautious when using heat sources to heat plastic fermenters; PET bottles have been known to will melt or warp when applying too much heat to them.''
* Electric heating blanket or heating pad.