SunSun HW-304B Aquarium UV Sterilizer Canister Filter, 150-gal

So I have a 390 gallon Koi pond in my backyard and it was doing really well for a while with no filter just natural water movement and critters taking care of things then my dog started drinking out of it and jumping in it and being bad dogs LOL so I bought the sun sun filter to help reduce the amount of dirt and algae and things that they were creating in the pond this filter took a muddy murky nasty 390 gal. pond and turned it cristal clear in 2 days it's so amazing I was worried that because it was only rated for 150 gallons it wouldn't do a good job however I've had Sun Sun filters in the past and they've always done fantastic this one far exceeded my expectations and it was a wonderful price So I have a 390 gallon Koi pond in my backyard and it was doing really well for a while with no filter just natural water movement and critters taking care of things then my dog started drinking out of it and jumping in it and being bad dogs LOL so I bought the sun sun filter to help reduce the amount of dirt and algae and things that they were creating in the pond this filter took a muddy murky nasty 390 gal. pond and turned it cristal clear in 2 days it's so amazing I was worried that because it was only rated for 150 gallons it wouldn't do a good job however I've had Sun Sun filters in the past and they've always done fantastic this one far exceeded my expectations and it was a wonderful price. … more

We have an outdoor stock tank pond in a covered area. I couldn’t get rid of the algae and the water was always cloudy. This filter was super easy to set up and within a week the pond water is clearing up to where I can almost see the bottom again.

Had this filter for a couple months now. Seems to be doing a good job on my 55. Arrived with one of the plastic screws that hold the hose brackets to the tank frame broken. Emailed the manufacturer for a replacement - no reply.

BEST FILTER I HAVE EVER OWNED. AQUARIUM HAS NEVER LOOKED SO GOOD.

Do your self a favor and buy something else, ANYTHING ELSE! U.V sterilizer died in less than a year. Tried cleaning the contacts, nothing. Priming this thing is next to impossible. It started leaking after 5 years. Bought new gaskets, still leaks. To the dump it goes. Good thing I always run a backup. My other 3 filters are Penn Place Cascades. Buying a new one of those. NEVER had a problem. Seriously, save your blood pressure and floor and do not buy this hunk 'o junk!

Love the new SunSun canister filter... easy set up with a little online tutorial (instructions should be made clearer in the manual.) I did purchase Plumbers grease separately for the rubber seals to hopefully keep them from wearing out...

I was completely disappointed Loss for words the biggest disappointment I’ve ever ordered

Just happened to notice water trailing from my tank just now. Traced it back to my 304b canister. Looks like a bad seal between the head and the bucket/body. Worked fine for 9 months and now 1 of the seals are bad. I don’t know if these come with a least a year warranty but I hope so.

Changing over from hang on back filters to canister was the best decision ever! This sun sun works amazing! It’s extremely quiet I have my 125 gallon in my living room and noise is never an issue compared to having a HOB.

This is my fourth SunSun canister filter, and all of them have been quiet, efficient, and worth their price so far. Like some other reviews here, I also initially had an issue with both getting one to prime, and also with air in the lines. But I also found this is mostly operator error; especially if you've never had a canister filter before (and I hadn't), there are some things that you may not know. One reason for constant air in the line as well as failing to prime is the hose length/placement. The canister runs on siphon; the pump head is meant to return the siphoned water to the tank, it's not really designed to pull it into the can and then also return it to the tank. So the top This is my fourth SunSun canister filter, and all of them have been quiet, efficient, and worth their price so far. Like some other reviews here, I also initially had an issue with both getting one to prime, and also with air in the lines. But I also found this is mostly operator error; especially if you've never had a canister filter before (and I hadn't), there are some things that you may not know. One reason for constant air in the line as well as failing to prime is the hose length/placement. The canister runs on siphon; the pump head is meant to return the siphoned water to the tank, it's not really designed to pull it into the can and then also return it to the tank. So the top of the canister inlet really needs to be lower than the bottom of the intake tube in your tank. The pump might be strong enough to circulate without being much lower, but it'll make it work a lot harder than it was meant to (probably make it fail sooner as well.) Constant air in the lines can have several causes; poor seal can be one (check the o-rings for dirt/debris, including the ones on the inlet/outlet connection). But more commonly it's either air left in the top of the canister after opening/closing it (tilt the can around a bit whenever you start it back up after having the lid off), and/or the hose having too much slack and trapping air. You can resolve the latter one of two ways - either temporarily hold the hoses with as much vertical position as you can manage (to give the air the best path to escape), or just cut the hoses shorter to have less slack (and thus also a more vertical orientation, assuming your can is below the tank as it ideally should be.) Cutting the hoses to be only as long as you really need them to be also helps with pump life/efficiency (less unnecessary distance to push water through.) … more