compact pressure filters with a unique patented cleaning system! Triple filtration: mechanical, biological and UV. The water enters the filter and is mechanically filtered through the foam layer, to then come out through the bio balls and the UV lamp. On the large models (60 and 100), biological filtration is performed only with filter foam, not with biological balls. Cleaning: the tap is placed in the rinse position, the lever is pulled up and the bars are turned a quarter of a turn so that the shoes push the filter sponges down. Dirt is swept away from the filter sponges by applying an up and down movement to the lever. This can also be done by means of the hooves to exert a higher force! Contaminated water leaves the filter through the drain fitting, so do not open the filter and rinse is done while keeping hands dry and clean! Fittings model 25/40: 1 "external thread with hose ends 25 / 30mm. Fittings model 60/100: 2" thread ext. with 32/38 / 50mm hose ends. Max pressure 0.4 bar. The max. valid for low fish content. For ponds with a lot of fish and little shade, the max. should be halved. The filter can be buried up to the cover. 5 meter cable. 3 years warranty (not valid for UV lamp and quartz glass).