Fact and Fiction in IC: Packed Bed Suppressors - old technology?
The following is published by Small, Riviello and Pohl, all employees of Dionex Coproration and as inventors named in the US Patent No. 5,597,734, dated 1997-01-28.
"However, membrane suppressors also have certain disadvantages compared to packed bed suppressors such as cost, leakage of regenerant cousing higher detector background, the requirement for an external supply of regenerant solution and the fact that membrane suppressors are complex and not user serviceable. Thus, it would be advantageous to develop an inexpensive, high performance packed bed suppressor approach."
That's exactly what Metrohm did. The Metrohm MSM Suppressor with 10 years of warranty is the most sophisticated form of "packed bed suppressors" available.