There are two paths to take when treating ponds, the path I choose includes the most natural options possible.  Most ponds under a couple acres need a few preventative measures to ensure future health, this does not include the continual use of chemicals.  Instead, I like to focus on beneficial bacteria/muck reduction/phosphorus control along with proper aeration to get your pond as healthy as it can be.  The results directly and indirectly positively influence the inhabitants of your pond (fish!).  So much can be gained by the proper preventative care that many are missing out on.  

I am a proud Easy Pro Pond Products dealer and can supply you with all your needs pond related.