Closing down my Aquascaping tank so selling off everything. I have 2 x Oase 600 Thermos in excellent condition. They have been modified for flow (the king in a tank) utilising expensive Biohome Media which are so much faster for flow rate and also for bacteria colonisation for keeping algae at bay. I’ve replaced the heater every 6 months also as you can see from the element. These 2 have run my professional set up with zero algae and I’ve cleaned them religiously once a month, and now fully sterilised for the new owner. The Biohome media was £60 in itself. I have extra filter floss available for free to split between the 2 sales.. The ultimate convenience among the external filters for aquariums. The external filter meets the highest demands in water filtration and filter cleaning. No complete cleaning needed: the EasyClean pre-filter chamber enables convenient filter cleaning. The automatic shut-off and safety lock prevent unwanted water leaks, e.g. when removing the pre-filter module. A practical venting button makes the water suction highly effective and allows for a quick and convenient start. The complete set includes filter media, hoses, adapters, suction and discharge pipes as well as the water diffuser. The BioMaster comes complete with the adjustable heater. Will deliver if within reason a reasonable distance from Maidstone if no collection available.