The negative assessment which is already present, I can only agree. Criticisms exactly: 1. The filter effect is minimal - at least with the one supplied filters. Maybe it goes better with additional built-in filters, but the cost then extra and really should a device, as it is supplied, function properly. 2. Heavy disassemble one breaks this is the finger off. 3. After instructions the ballast chambers can be filled with sand. Then also most do, because hardly anyone has just gravel stock. Unfortunately, the chambers are not tight, the sand flooded and polluted the pond additionally. 4. The manual is insufficient. 5. Since the device quickly contaminated due to the weak filter effect and will no longer be properly inflated, it must (about 1 time a week) are cleaned constantly. For the one who has nothing better to do, so suitable to escape the boredom. All others should not buy this filter!
