What is the difference between these buckets other than price? http://hoeggergoatsupply.com/xcart/product.php?productid=3328&cat=80&page=1 http://www.jefferspet.com/ssc/product.asp?CID=0&mscssid=DQBS375XRR338JTTT65P4W6J9645D571&pf_id=16034 6 qt. at Hoegger's is $32.75, at Jeffer's 6 qt. $11.82 I understand that one is dairy grade, what does that mean? Will the cheaper one work just as well?