I'm very happy with the Fluval U4 and it was delivered quick. However the top piece was already broken when I opened it and it smelled kind of used?I do not know how to contact the seller but i prefer it a bit broken then send it back etc. so I keep it like this.Fast delivery which amazed me!

Fluval was a big upgrade for my previous filter. It does a great job and I am pleased with it. Sometimes it takes a while to start up after being disconnected for a clean or aquarium water change, though everything else is great.

Is een prima filter en doet wat ie moet doen. Zeer aan te bevelen

Finalmente acqua limpida,in un acquario da 120 litri sostituito con un altro filtro di capacità più ridotte, e’molto silenzioso ,il flusso è abbastanza delicato non smuove troppo l’acqua fa un ottimo lavoro

__________________________________________________________________________UPDATED 7/26/12-- see bottom part of entry-- upgrade from 3 to 5 stars__________________________________________________________________________Original review June 2012:I'm writing a long review because I found it helpful to hear others' experience specifically with turtles. They are a little different than fish when it comes to what works.I have a painted turtle, about 5-6 inches long right now. We have an algae eater too who helps keep the tank clean (we call it a sucker fish, not sure what its real name is). We also periodically add small minnows and goldfish to entertain the turtle and for food if we forget to feed her or go on vacation. Since she's primarily a water turtle, her tank consists of mostly water with a few haul out spots.We just upgraded from a 20G tank to this one. Previously we've always used the Whisper Quiet filters with great success. People would rave about how clean the turtle tank was, and we could pretty much ignore it (don't worry about changing water, etc.) In the 20G tank we had the 20-40G Whisper Quiet in about 16G of water, no plants, a few submerged items, and a floating plastic "log" for basking. For the 50G, we added a few more submerged and surface items, but all are plastic or rocks, nothing living.Upgrading to the 50G tank (with about 40-42G water) posed a problem for me. All of the larger hang on back filters required the water level to be higher than I wanted, since the turtle needs some land, and I didn't want it climbing out. I tried rigging a few up-- the larger Tetra one worked very well, but I had to rig it inside of the tank, and it just took up too much room.I decided to try the underwater Fluval for two reasons-- never need to worry about water level, and because I'm not willing to invest in a canister filter.PROS:--silence. it's golden--ease of changing filter media (it's really simple, you can lift it up so you don't contaminate everything or spit junk back out)--will never dry out or burn out if you lose power and it restarts (since submerged)--ability to place where I like in the tank for optimal filtering and flow to stir things up--ability to change parts of filter at a time to preserve beneficial bacteria--foam pad separate from other pieces so you can rinse that and not everything--no splashing, so no hard water stains on side of tankCONS:--I want to love this filter and I hope it works long term. We used it in a tank that had been recently filled and set up, with the Tetra running for about a week. Initially this worked really well, but about a week into it, the water turned nasty green. First off, TURTLES ARE DIRTY. By nature I don't think this filter accomodates that. I'm holding off judgement since it sometimes takes a while to get things right when you set up a new tank, as it happened before with other filters too at times. However, in this case, I think it's because of a lack of active carbon in the filter. There is just a tiny bit there, and in my experience (6 years with this turtle), the active carbon is ESSENTIAL to keeping them from getting stinky and gross. I decided to remove the bio pellets from the middle part (step 3) since I never had them before in my tanks anyway, and instead fill that space with one of the tetra filters filled with activated carbon. It's been about 10 hours. The nastiness is gone and the tank looks much better. There still seem to be a lot of particles in the water, but I am continuing to work on that-- not sure if I can blame it on the filter at this time. I will keep adjusting, because I think this filter is worth figuring out how to make it work for turtles.I gave it three stars because it advertises that it can be used for my purpose, but I don't think it comes through with the media it uses. I also think their media replacements are expensive relative to other filters (which is especially frustrating when they aren't even working for me). However, if the makeshift adjustment of using other carbon filters inside the third chamber is effective, I would upgrade to 4 stars. If I get to perfectly crystal clear water without the need to pay attention to the tank every week (yes, it's possible with some cheap filters), I'd go to 5 stars. I ask a lot from my filters!___________________________________________UPDATE 7/26/12This definitely deserved the upgrade to five stars. I had to leave for three weeks after adding the Tetra carbon filter to the center in place of the bio pellets, so I filled it with a bunch of minnows for her to eat over time, then came home to a tank that was still crystal clear after 24 days. (Trust me, I was almost afraid to look at the tank when I returned for fear of how gross it might be.) A few minnows were still swimming around happily too. I went ahead and swapped out the carbon filter, but it looks like I can simply wash out the outer sponge and pathetic carbon insert supplied with it periodically and replace the Tetra carbon insert in the center chamber monthly. I still don't like that I had to adjust it, but I don't think there's a great product out there for turtles, and this is working VERY well. Plus, I am now purchasing the cheaper Tetra filters, so my ongoing costs will be less.If you go this route, it does seem like a very tight fit to fold over the Tetra filter and slip it in the middle chamber, so don't be shy. Just wiggle it as you push it in and be gentle.All that remains to be seen is longevity, but for now I am one happy consumer!

Ho appena acquistato un nuovo filtro per il mio acquario e devo dire che sono davvero soddisfatto dei risultati ottenuti. Questo filtro funziona in modo eccellente, garantendo una pulizia costante dell'acqua senza alcuno sforzo.La cosa che più mi ha colpito è la sua silenziosità. Rispetto al mio vecchio filtro, questo è praticamente inudibile. Non solo è piacevole per me non sentire costantemente il rumore del filtraggio, ma anche la mia tartaruga sembra apprezzare la tranquillità. Posso dire con certezza che il mio animale si sente più a suo agio senza interferenze sonore fastidiose.Inoltre, la facilità di pulizia di questo filtro è davvero un punto a suo favore. Basta rimuovere il meccanismo di filtraggio e sciacquarlo con acqua corrente per eliminare i residui accumulati. Non è necessaria alcuna procedura complicata o l'uso di prodotti chimici. È un'operazione rapida e indolore che mi permette di risparmiare tempo e fatica.Ma la cosa migliore di tutte è che grazie a questo filtro, posso cambiare l'acqua del mio acquario con meno frequenza rispetto al filtro precedente. La qualità dell'acqua rimane costantemente alta e pulita, senza dover fare interventi continui.La mia tartaruga sembra molto più felice e il suo ambiente è molto più salubre. Sono davvero contento di aver acquistato questo filtro per il mio acquario. Lo consiglio a tutti coloro che cercano un prodotto efficiente, silenzioso e facile da pulire. Non ne rimarrete delusi!

I had a cloudy aquarium with a filter priced 400 rs. It had to run for a week to make the water clear and the water flow was strong which made the fish hard to swim on their own. But this filter does magic. With in some hours after installation, the water became crystal clear. The flow is very smooth too.

Top Filter! Hatte vorher ein Jahr einen anderen (von T) und den ständig sauber gemacht, manchmal mehrmals die Woche und trotzdem war ich nie zufrieden.Dieser hier ist geräuscharm, kein Summen des Deckels o.ä., er muss super selten gereinigt werden, Wasser- und Luftstrom sind stark und regelmäßig sowie gut einzustellen. Bin sehr zufrieden!