I think the mods will be along to tell you that kurtail is for professional use only & should only be bought & used by someone with a license.
On the other hand one of my half plots was riddled with horsetail when I got it in 20111/12. It really got me down,wished I'd never swapped plots to have side by side halves. 2012 was really wet year,hardly anything grew I became quite despondent,but read up about it a lot.
So I decided to look at its habit. It has long,long roots so takes moisture from very deep,not near my wanted plants & seeds. It will always be there,I know I won't iradicate it. I read its best to let it grow to about 7-10cms then pull it out as by then it has expend lots of energy into growing,so that's what I do. If I have bare soil I hoe it off, in planted beds I let it grow & really pull it up getting it up gently until I hear that snap. If I'm digging I dig out as mush as I can. I did spray with roundup 300 or something a few times to get rid of the couch grass etc which gave me a good start to be able to work on the horsetail. I cover beds with cardboard & manure where possible & plant some crops through weed suppressant membrane. I now don't let it bother me & do you know it isn't half as bad after 3 years of that treatment. In the spring watch out for the stems that release the spores they look like very thin pinkish toadstools, I pull them up straight away.
It will still grow through membrane if you dig beds out & bury it so I wouldn't go to that expense,but use the membrane for paths with perhaps cardboard underneath or mark them out & keep the hoe going.
Hope that helps,you will get there it just takes time & effort. Have a look at the photos on my diary