>- You could be right… But whatever you will do, there will be always some parasites left alive.
This situation (3mn instead of 7) is only a progression between no zapping at all, and a standard 7mn, to reach ASAP.
Again, I guess that this is where we just have to differ.
From the extensive customer feedback that I received over the past 9 years, 7 minutes, 3 times on the same frequency should be a minimum. Anything less may be more trouble than doing more.
Also, as the user pointed out in their original statement, they only zapped 1 time on each frequency. That is why they had problems.