glypoghen weed killer (Sainsburys GL52)

Please not this is the commercial grade, not the watered down stuff the stores sell, you need to mix it with water, it is safe to use on or near watercourses, and is used as a lubricant by foresty workers on their chainsaw when cutting back IVy and large infestations
it is the only reccomended treatment for Japanese knotweed, several applications followed by an early application when it starts to pop up, will kill it off, thus allowing you to dig the roots out
however it is a powerful chemical so I dont want any one who does not fully understand its use thinking they can kill garden weeds with it
and I will record your name and vehicle details for my own protection
also I will vet you and If I feel uneasy about your capabilities I will not pass it over