Surgery just clears everything out completely at one time and widens openings..
You still have to deal with the underlying problems or they may gradually come
back.  And if you deal with the underlying problems (allergic or irritant
inflammation, infections etc.) then you may not need surgery.  It depends how
far thickening has advanced in the sinuses (CT scan).

If you have a moderate obstruction due to a deviated septum, then you
likely will benefit from surgery.  If you have any polyps, they need
removed.  The sinus drainage passages definitely need to be open and
surgery can usually help with this, be it turbinate reduction (RF
ablation), or actual full surgery.

The sinus rinse (Nielmed) works well, try and get the DR to write a
script for sterile water for irrigation in the bottles for right after
surgery though for this.  After it has healed standard distilled water
will work well, bring it to boil and let it cool down to body
temperature before using.

Keeping things draining and clear is the key.  If it gets obstructed,
then fluid builds up, bacteria or mold grows, things get progressively
worse.  The advise of dealing with the cause is very important, get
allergy tested, have your house mold spores checked, etc.  Proper
management of allergies is usually the key, could even be a food
allergy.

If the sinuses stay clear, then no need for a daily sinus rinse.
Excessive sinus rinse moisture can promote mold spore growth in the
nose.  I use it only when I notice a blockage starting to occur. I make
sure I take something or use Vicks to open it up initially before
starting the rinse therapy for a few days.