Date:Tue, 16 Jan 2001 12:21:05 EST
Sherry: After having conversations with two separate vendors, I am not sure there is an easy answer to your question. Here are the responses: 1. One vendor did not rule out CRC canisters, but did state it becomes difficult to use canisters when the flow per day is low and inconsistent. The reason is channeling, plugging and=A0 microbial growth (slime). There is a higher probability of having very inconsistent silver recovery. IN these scenarios the system would have to be closely monitored for problems. 2. The other vendor, who markets CRC cartridges, assured me that they can be used in low flow situations of less than one gallon per day. The key is the=20 construction of the ion replacement material. A steel wool cartridge is prone to channeling in low flow situations, but one made of steel wool mesh should resist channeling The vendor, CPAC, recommended their RePac 10 unit. More information on this product can be found at http://www.cpacequipment.com/dvdofferadbox.htm. Information about their entire product line can be found at http://www.cpacequipment.com/dvdofferadbox.htm. CPAC's home page is www.cpacequipment.com. Another option would be to save the solution and either precipating and filtering it or running it through an electrodepositon unit. These two will usually give more consistent results, but more expensive. I think you will have to cost out each of scenarios and see which one makes the most sense from an economic and environmental liabilities associated with each option. Please recognize that the mention of CPAC does not constitute an endorsement of their products by PNEAC or GATF. The information is being provided for informational purposes only.