Yes they did. I'm a major fan of Tunze and not just because they have donated. I have osmolators on all of my tanks, 5 tunze skimmers and many Tunze pumps. I have had two problems with my tunze equipment and both times their sales rep immediately sent replacements after i called them. I'm a particular fan of their internal DOC skimmer:
It's very small but rated to 65 gallons. I have 3 of them in different 30 gallon tanks around the school, it doesn't have much of a footprint but pulls a ton out. Some of the kids chronically over feed and water quality is an issue. This tank gets used and abused but was tested by Elyes with 0 nitrates today.