1 Battery compartment cover with button 2 Battery holder 3 Unlocking button 4 Housing 5 Impeller 6 Impeller holder 7 Filter element 8 Locating device 9 Cover 10 Suction jet 11 Extension jet.

Installation
Set the impeller on the impeller holder, and fit the suction jet and the housing together.

Insert the batteries
Remove the battery compartment cove by applying pressure on the unlocking button. Insert the batteries in accordance with the pole markings +/-. Please make sure the batteries are fitted correctly. If not, the impeller will run in the reverse direction with very limited power. Make sure that no moisture gets into the battery compartments and ensure that the sealing ring fits properly when you close it. The unlocking button then has to noticeable click into place. The alkaline batteries which are supplied with the automatic grave cleaner last for an operating life of approx. 4 hours and if nickel-cadmium storage batteries are used these last for approx. 2 hours.

Cleaning the bottom
After the suction jet-and, if required, also the extension jet- have been connected to the pump chamber the cleaner is ready for use. For cleaning the bottom the suction jet is used for loosening the gravel layer to a depth of approx. 1cm, whereby the sludge is churned up and drawn into the suction stream of the pump. In this way the useful bacteria remain undisturbed in the lower part of the grave bed. The waterproof button can be used to conveniently switch the cleaner on and off. When switched off any gravel which has been sucked up falls back to the bottom. Continue to clean an area until the water in the suction jet is clear.

Cleaning the filter element
Press the two locating buttons on the sides and pull out the filter element. The cleaner itself can remain in the aquarium. Take one or both covers off the filter element and thoroughly clean out the dirt which has collected there by holding it under running water. after cleaning the filter replace the cover. Now put bottom of the filter element into the cleaner first and then snap home. After using in marine water thoroughly rinse out the cleaner with tap water. To clean the unit remove the suction jets and filter elements, pull off the impeller wheel and rinse it thoroughly under running water. Keep the battery compartment closed. Make sure that the automatic gravel cleaner is only operated under water so that the impeller does not run dry. When stirring up small dirt particles the aquarium water can become slightly cloudy. However, this is quickly removed by the aquarium filter.