here you go chaps: https://www.youtube.com/watch?v=6HwSJLO_cVs
An explanation of what Vision is probably doing if you search about on youtube under 'surface tension' there's a delightful video demonstrating how a detergent or soap breaks down surface tension of water when sprinkled with pepper.
If I find it I'll stick it up on here - amazing how little is needed.
Your spot on Dave.
Im not going to go into too much detail but......
Your right in what you say about the surface tension. In fact surface tension reducers are in pretty much every cleaning product out there. It's which ones do the best job for pure water additives which is the tricky part.
That's just a small part though. We've also found that when mixed wrongly, (along with the other things in vision) it can form a glue type mixture and turn into a solid mass. Obviously not something you want to be putting near any WFP equipment which would render pumps/hoses and jets ruined. Luckily we spotted this before we seriously damaged any equipment and stopped using those types of combinations.
I'm just trying to say it isn't a case of getting a surface tension reducer and putting it in your tank, and I really would not advise people to start doing that. We've learned from experience with this, and had trained chemists to call on for advise when we messed up in the early days.