PondDoc

Aqua Ultraviolet's Advantage 2000 and 2000+ are small UV units for very small ponds (up to 500 gallons) and large fresh water and salt water aquariums.  Both models have black PVC housings with 3/4" barb (flex hose) outlets.  These are connected to your pumping and filtering system via 3/4" flex hose only.  

The manufacturer's ratings for how many gallons each model will do are extremely distorded and absolutely ridiculous so I'm not wasting your time with listing them.  Instead, we have listed OUR ratings below.  They are realistic so you won't purchase a unit that will not work for you.