Sunsun Sun HW-704B 525 GPH 5-Stage External Canister Filter with 9W Uv Sterilizer

This pump is amazing for the price. It fits well in the aquarium stand I bought.The tubing is stiff but once they are on they are attached well. The filter comes with some thin pads and I added more media to fill up all four trays.The quality is very good and it is very quiet.I watched a couple of YouTube videos on how to prime it and none of those worked for me: I followed the instructions that came with the pump: fill the canister with water, then I filled the tubes with water too and then the priming worked for me. I am sure I did something wrong to begin with, but that is the only way it worked for me.Anyway we really like how the pump and filter functions and its design is very simple.

Beautiful filter was great so far been installed now for a week...love it...Got two of them on a 125 gal. tank..water is super clean and clear....lots of room for media in the trays as well...wonderful product. Great price. Not loud at all...will last a long time the way it is built...it's a big unit so it is heavy once all the media and water is in it....doesn't run hot at all...smooth doesn't stick.

These are priced like disposables for a reason. One was DOA the other Died after 6 months, third still running fine.I bought two of these to replace two Rena Filstars I have been running on two large tanks for 9 years. I too was drawn in by the low cost and reported capacity. Of the first two I bought, one leaked from the start. The other was fine. I tried putting a little silicone grease on the seals to see if that would stop the leaking but it did not so it had to be returned.The second was working fine for the first 3 months but, following a power outage I noticed that it also began leaking if the pump wasn't running. This was a huge problem for me because I live in a heavy lightning area (Tampa Bay area) so there are frequent power outages. By this time the replacement for the first filter had arrived and has been running fine for the duration, although I am still not as confident leaving the house for several days.Meanwhile, the second filter was getting worse. All my fish started dying off. But the water was clear and everything looked fine. Eventually every fish died except one trooper of a greenback. A couple blennies, starfish and hermit crabs also survived, but everything else, about 12 fish, died. I decided something bad had gotten in the water and I would have to clean the tank. When I touched the tank I got what I thought was a static electricity shock. But then I touched the water and got a shock from that. Through process of elimination I learned it was, of course, my cheap filter. I got a shock while standing on a dry carpet floor. I wonder what would have happened if my tank had leaked more and soaked the carpet and THEN I touched the water. Luckily I only populate my tank with interesting fish from the bay so the cost was minimal, although I did feel some remorse about slowly electrocuting my fish to death.Now this puts me in a jam. because even though this was sold by American seller and eligible for Amazon prime the company is Chinese. Therefor, after the first month all problems must be resolved through the Chinese company. This means to be repaired or replaced will likely take up to a month there and a month back. Even if they sent a replacement before receiving my return it will be at least a month. This means I would need to find another filter to hold me over for that month. Then I would have to hope that the FOURTH filter doesn't crap out like two of the first three did (not a safe bet).I am 51 years old and have had aquariums and terrariums most of my life. I have never had any filters fail at the ridiculous rate that these do. In fact, I can never even remember a filter failing. I have only bought new filters after several years when it feels like they just aren't strong enough anymore, or for larger tanks. These filters only had three trays filled when I used them. The first two had gradually finer filter pads and the third was a layer of biohome. The fourth was empty. They were cleaned every two months. There was nothing impeding the flow to cause such a failure.they are cheap because they are cheaply made and unreliable. Even if they start off working fine they can start to leak or have system failures even under perfectly normal circumstances and with no warning (except a lowering water level). And, as stated earlier, you will never feel completely confident that your tank won't drain if you leave the house for several days. My tank has two large tanks in the cabinet underneath in case of leaks. By the time I caught the second filters leak the water was an inch from the top of the drainage tank. If I did not have that tank I would have had about 30 gallons of water on the floor and if I was a way I could have had another 40. That is too much risk and future worry to save about 50 bucks.It was worth a shot for me but let me save you the hassle. Go with something more reliable. The lack of problems and much greater peace of mind are well worth the extra money. I will try to return the second unit for a refund and find something I won't have to worry about so much.Update: NO CUSTOMER SERVICE RESPONSE! I sent an email to the company, Sunsun, on the same day I posted my review. I sent it to their complaints department, their North America Manager and their company manager as listed on their website. I sent a follow up email every day. Still no response. I will update if they ever respond.

I have had this filter set up on my 75 gallon for about 24 hours now. Instructions weren’t great, but YouTube helped to clear some things up during setup. Hoses are sturdy but rigid. Dip the ends in hot water prior to attaching and it’s much easier. I’ve read reviews that the filter seems cheap or flimsy, but I have to say, it’s much heavier than I expected it to be.The reason for 4 stars is due to the UV light. The bulb I received would not stay in place, so I had to attach the bulb cover without it. Not a huge deal since I hadn’t really planned on using the UV light anyway, but if it’s a mentioned feature of the unit, it should function appropriately. Overall though, this filter I am pretty satisfied with. I plan on buying spare o-rings in the event of failure, but you really can’t beat the price of this unit. It’s definitely worth the gamble compared to the fluval pricing. Treat the canister with care and you should have success. Will update this review after it has been running a while. May purchase another for my 55 gallon.