Have got a CT scan confirming sinus infection in the front left ethmoid
sinus, having found a reliable ENT recommended by other sinus
sufferers, he's suggesting surgery to do 3 things.

As far as I recall, it's 1 to drain my infected sinus, 2 to widen the
nasal passage, and 3 to correct a slightly deviated septum (yes I have
read here how this is always suggested)

While I consider this I'm wondering is it worth me giving the Grossan
irrigation system a try? Could this potentially clear up my problems
without any need for surgery, keeping in mind I've had the infection
for a year and tried many combinations of antibiotics, betnesol,
flixonase, salt water spray etc.

I know how big people are on hydropulse here so am willing to give it a
shot before going under the knife and experiencing the ensuing pain
etc, tho don't want to waste my time and delay surgery if surgery is
actually going to improve me.