SUNSUN CBF-350 Bio Gravity Pond Filter Up to 1500 Gallon

Pretty straight forward as far as setup went. Now to be honest this is not my first rodeo so I am speaking to the more experienced Koi pond owners. I've got a small 850 gallon outdoor Koi pond with approximately 50 different sizes of fish, along with snails and of course frogs. I do use water hyacinth, and submerged plants also. I've been using a Tetra pressure filter for the last couple of years with decent results ( just did more frequent exchanges with less volume). This year though with the tremendous amount of rain and temps being all over I couldn't get it under control without possibly going the chemical route. Anyways making this boring ass long story short I did due diligence and research and decided to try this first before the chemical route. 24 folks....24 hours, that's how long it took for the pond to go from the smelly swamp ass to actually something pleasing to be around. Now I'm sure cleaning the filters will be nothing to celebrate (actually it's a great design, pull them out, hose them off, slide them back) but with the job it's done so far it's amazing.

The water flow passes theoretical because there's so many gaps for the water to reach the path I had to clean the filters every 8 hours for my pond Which is less than a thousand gallons

I own two of these. I bought one a few years ago that is still working great and bought this one for a second pond. Keeps my pond crystal clear and I only have to clean it once a year.

The instructions are useless. Luckily I found a video on u tube. Once it was installed my pond was totally clear in a matter of hours.

This filter treats the circulating water in our bird bath. The birds absolutely love the water so using that as a guage of effectiveness this filter gets 5 stars.