No, dont use liquid f90..........!!!!!
Use powdered f90, mix it in an old f90 busket (with no indents in the base of the bucket to trap product in),
add the desired amount and then the hot water and use a whisk to give it a damn good whisking!!!!!!
If you are unsure whether there are lumps/bits still there, pour it through a sieve into your tank and/or
sprayer, depending how you are using it!!!!!
Steve i find the liquid to be not as good and to be too bloody foamy!!!!!