Eheim Quick Vac ProA well-kept aquarium radiates crystal-clear cleanliness right down to the gravel bed. However, dirt particles, plant debris and organic matter repeatedly form an ugly layer of sludge. This provides the breeding ground for unwanted substances which pollute the water. The newly developed Eheim Sludge Extractor is therefore an ideal helping hand. This handy tool functions like a conventional vacuum cleaner. Battery operated working duration of up to 4 hours, easy handling, powerful suction, pump suction Jet With extension element, suitable for Marine and Freshwater fishtanks.