Stonyfield Farm Announced A Nationwide Recall of Specific Fat Free Plain Quarts Code Date May 6 and 7, 2009. The products are being recalled because they may contain a presence of food grade sanitizer. Affected products are limited to Stonyfield Farm 32 ounce Fat Free Plain yogurt UPC # 52159 00006 carrying one of the following product codes printed along the cup bottom that start with the following date codes: May 06 09 Time stamped 22:17 thru 23:59 (limited to these specific time stamps only) May 07 09 All time stamps