The Eheim Mini internal filter has been reported to have a defective impeller design, which can cause it to stop working or become noisy over time. Additionally, some users have experienced issues with the filter leaking or not fitting securely in the tank. These defects can lead to a decrease in the filter's effectiveness and reliability, making it a less desirable option for aquarium filtration. **

The Eheim internal filter may not be pumping water due to a clogged impeller or intake tube. Check to see if there is any debris or blockage that is preventing the impeller from spinning properly. Additionally, the filter may not be receiving enough power or the motor may be malfunctioning. It is also possible that the filter is not properly installed or the water level is too low for the filter to function effectively. Troubleshooting these potential issues can help resolve the problem with the Eheim internal filter not pumping water. **

Without more specific information about the issue with the Eheim filter, it is difficult to determine if it is defective. Common issues with filters can include clogging, leaks, or motor malfunctions, which may not necessarily indicate a defect in the product itself. It is recommended to troubleshoot the problem, contact the manufacturer for assistance, or seek professional help to determine if the filter is indeed defective. **

The Eheim filter is called the Eheim Classic Canister Filter. It is a popular choice among aquarium enthusiasts for its efficient and reliable filtration system. The Eheim Classic Canister Filter is known for its quiet operation and high-quality construction, making it a trusted option for maintaining a clean and healthy aquarium environment. **

One common problem with Eheim filters is that they can be prone to leaking if not properly maintained or if the seals become worn out over time. Additionally, some users have reported issues with the impeller becoming clogged or malfunctioning, which can lead to reduced water flow or complete filter failure. It is important to regularly clean and inspect the filter components to prevent these issues and ensure the filter functions effectively. **

The Eheim filter may not work after cleaning due to a few reasons. One common reason is that the filter media was cleaned too thoroughly, removing beneficial bacteria essential for the filtration process. Another reason could be that the impeller or other internal components were not reassembled correctly after cleaning, causing a disruption in the filter's functioning. It is also possible that the filter was not primed properly after cleaning, leading to a loss of suction and reduced filtration efficiency. **

To determine if the impeller of the Eheim Aquaball filter is broken, you can visually inspect it for any visible damage or wear. Additionally, you can try removing the impeller and checking for any signs of damage or obstruction. If the impeller appears to be intact and free of debris, you can also try running the filter to see if the impeller is functioning properly. If the impeller is making unusual noises or not spinning as it should, it may be an indication that it is broken and needs to be replaced. **

The best internal filter for your aquarium will depend on the size of your tank and the specific needs of your fish. Some popular options include the Fluval U-Series and the Penn Plax Cascade. The Fluval U-Series is known for its quiet operation and adjustable flow rate, making it suitable for a variety of tank sizes. On the other hand, the Penn Plax Cascade is praised for its powerful filtration and easy maintenance. Consider the size of your tank, the type of fish you have, and your maintenance preferences when choosing the best internal filter for your aquarium. **