best pond equipment?

[Amy <amyh at attbi_com>]

Hi,

My mom has a medium-large pond with lots of plants and koi. However, 
she's had trouble finding quality pumps, filters, etc. As a planted 
aquarium owner, I'm familiar with the best aquarium equipment, but not 
the best pond equipment. Who are the big names in pond gear? The stuff 
Home Depot sells is terrible. Specifically, we're looking for pumps and 
UV sterilizers.

Thanks for all your help.

Amy