Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgFri, 21 Nov 2008 17:59:08 GMT20http://www.wef.org/TechnicalDiscussions/Topic8991-15-1.aspxSounds like iron in the ferric form. It wouldn't interfere with use as a dessicant.</P><P>I'll bet you'd get fine results using calcium chloride, dihydrate, from the hardware store.Sat, 26 Apr 2008 15:10:59 GMTDedalushttp://www.wef.org/TechnicalDiscussions/Topic8991-15-1.aspxWe use <STRONG>anhydrous Calcium Chloride, CaCl2,</STRONG> to make one of the<STRONG> BOD dilution water</STRONG> nutrient solutions. We have used <STRONG>Fisher C77-500</STRONG> dessicant grade for quite a few years with no problems...UNTIL we started using a new lot <STRONG>(Fisher Lot# 074872)</STRONG> and found that the solution turned brown (tea colored) within an hour or less and formed a dark precipitate within a day. </P><P>Anyone else having a similar experience? We are looking for a new source of CaCl2.</P><P>Thanks, KeithFri, 25 Apr 2008 14:33:08 GMTkeith chapman