During the test I was still in the early stages of setting up my fish house. This put me in the convenient position of having nine 24” tanks available in which to test filters, with seven containing no fish — so I would do two batches of tests, seven at a time. Fluval U Series Underwater Filters provide complete and efficient 3-stage filtration, including BIOMAX biological filtering, to create superior aquarium water quality. Fluval U Underwater Filter provides complete and efficient 3-stage filtrationto create superior aquarium water quality. All models come with a Bio-Foam filter pad to remove large particles. The larger 2 sizes also include a Poly-Carb pad to assist with removal of fine particles, chemicals and odours. They also have the addition of Biomax filter nodes to assist with biological filtration. Anpassbare 3-Wege-Durchflusskontrolle: oberer Auslass für Umwälzung und Sauerstoffanreicherung, integriertes Düsenstrahlrohr für einen sanften, gleichmäßigen Durchfluss und unterer Auslass für eine Wasserbewegung am Boden des Aquariums Fluval U series filters provide the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The Adjustable 3-Way Flow Control feature (available in the Fluval U2, U3 and U4 models) lets you position the water flow output to meet your specific needs. The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deep-water agitation.

Internal Filters are an excellent option for small to medium sized aquaria. They are simple and easy to set up, they sit just inside the aquarium itself meaning they can be easily installed into any fish tank, with no troublesome pipes and hoses. They will also work well as a powerhead for water circulation, with the added bonus of the extra filtration. It is worth noting that you should clean your filters impellor every couple of weeks to ensure it is functioning normally and keeping the water moving around the tank. U series underwater filters offer superior water purification, movement and aeration capabilities and have been designed for use in both fresh and saltwater applications.The ability of some filters to take extra media is a feature that has definitely come to the fore in recent years. The more media the better, as it means more cleaning power and more waste reduction power. Depending on the type of fish that you keep, you are either going to want slow or fast flow and a flow control that is simple but effective.

For alternate cleaning. If sponge is the only media available for your internal filter it is tasked with performing the roles of both mechanical and biological filtering. The sponge needs frequent cleaning, yet cleaning risks the bacteria colony. The solution is two sponges, so that they can be cleaned alternately, or even replaced alternately, and the bacteria remains intact. The Fluval brand (by Hagen) has become one of the most well known names amongst fish keepers and it is for good reason. For many years now they have provided one of the highest, if not the highest level of quality when it comes to aquariums, filters and other accessories fish keepers have come to know over time. They have expanded their range over time but the quality has stayed the same. The adjustable 3-way flow control feature lets you position the water flow output to meet your specific needs. The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deepwater agitation.Carbon inserts have visible benefits as they remove dyes from water, odours and traces of medications. They remove chlorine too. But, for me, the best media option of all is extra biological media. As with the double sponge scenario, one doing the mechanical filtering and leaving the other to do the biological filtering, is better than one media that is tasked to do two jobs. In my book, extra biological means a better filter. A simple media upgrade is the polyester pad, though with some models it appears to be more about selling the pads as a disposable and hence replacable item more than it actually appears to benefit. In terms of features this filter has a three-way flow, offering water flow from the top outlet, the bottom outlet or the built- in, vertically-mounted spraybar in the middle. The flow from the top and bottom outlet is directionally controllable, and a Venturi is supplied. Not much really, other than the flip-top was a bit stiff on our new model and impeller access isn’t as accessible as it was on the previous Fluval plus model.