Oase Biomaster Thermo 850 (amazon): https://geni.us/Yzrg3UG
Oase Biomaster Thermo 850 (ebay): https://ebay.us/7U6j4n
Foams and Biohome Ultimate: http://www.filterpro.co.uk
(FilterPro site has links to suppliers in other countries)
White overflow pipe (21.5mm OD): https://geni.us/Fo9CqU
(Or go to your local DIY store)
Biomaster Pre-filter foams (Coarse 30PPI): https://geni.us/zABv
Biomaster Pre-filter foams (Medium 45PPI): https://geni.us/LnZYLeB
Biomaster Pre-filter foams (fine 60PPI): https://geni.us/L7lL
Follow me on Odysee: https://odysee.com/$/invite/@PondGuru:0
The Oase Biomaster 850 canister filter is well designed, has excellent contact area for mechanical filtration in the removable 'pre-filter' and a decent provision for biological filtration - 5kg of Biohome Ultimate easily fit in this filter.
Since it holds at least 5kg of biohome ultimate it is really suited to normally stocked tanks of up to 500 litres (132 US gallons) or heavily stocked tanks of up to 250 litres (61 US gallons) if you want to achieve a full cycle but bear in mind that the heater is 400W which makes it suitable for a tank up to 400 litres (105 US Gallons).
'Official' Oase Biomaster Canister Filter video: https://bit.ly/2OEkkVb

A full cycle is completed by bacteria - the aerobic part of biological filtration which processes ammonia to nitrite and nitrite to nitrate followed by an anaerobic part which processes nitrate into soluble nitrogen which bubbles off to the atmosphere.
Therefore it requires a suitable amount of excellent quality filter media to be able to provide the environment for both aerobic AND anaerobic bacteria - that is what Biohome ultimate does perfectly but even with such good media there are limitations and we recommend the following amounts for different stocking scenarios:
(1 US Gallon = 3.8 litres)
(1kg = 2.2 lbs)
Average community tropical aquarium = 1kg per 100 litres
Average coldwater aquarium = 1kg - 1.5kg per 100 litres
Predator aquarium = 1.5kg - 2kg per 100 litres
Large cichlid aquarium = 1.5kg - 2kg per 100 litres
Malawi / Tanganyikan aquarium = 1.5kg - 2kg per 100 litres
Marine aquarium = 1.5kg - 2kg per 100 litres
Average mixed fish pond = 1kg per 200 litres
Average koi pond = 1kg per 150 litres

You may be disagreeing with the above figures but remember that they are for a FULL CYCLE not half a job - achieving 0 ammonia and 0 nitrite is quite easy since aerobic bacteria grows freely on any surface but the anaerobic bacteria responsible for COMPLETING the cycle needs more a specialized habitat.
Size a filter properly, set it up sensibly and you will have perfect water - it's that simple....and your filter won't be the dreaded 'Nitrate factory'.....you'll spend less money on treatments too......basically the filter is the foundation of a
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https://www.youtube.com/watch?v=ujIQ9Kb1fPo