the problem with two or more jets is that you reduce the psi you start off with...if you are using a portable then it is already limited why would you want to limit it even more? I use a single fan jet that is hidden in the wand head (splash guards) therfore you get no overspray and the solution keeps/ stays hotter to strike the carpet with, not only that but more than one jet creates water streaking even if it cant be seen....... and its more equipment to maintain or that can go wrong., best, Dave