The conference call indicates management is very satisfied with propane fracking with high rate of delivery over 30 days. They also have hydrofracked a second well that needs more time for comparison. They will be reporting on the comparison. You can download the message from their website:
Now, if I got it right, Sonde is reworking old wells and, if I also remember correctly, GSF said someplace that their first use in TX was in a rework situation. Anyway, it's this kind of additional potential that gets my juices going because there have to untold numbers of played out wells in spent oil fields that are amenable to this tech to enhance the stripper well activity that currently provides a big % of the oil being recovered in the U.S. today. This work will be down the road but it represents a huge potential for GSF in coming years, IMO.