Suitable for ponds with fish up to 24,000 litres. This pressure filter can be cleaned without opening the lid! Simply switch to \'waste\' mode and scrub the dirty filter sponges via the external handles - the dirty water exits the special waste outlet (see attached pictures). Also features a high powered 25w UVC x 2 (50w total), filter foams and biospheres in the bottom chamber Please note this 28000 set consists of two Pressure-Flo 12000 filters supplied together with a sturdy T-piece and connecting hose for connection to a single pump. * If your model was made pre-2015 you need 2 x official single-ended Laguna 25w bulbs, however 2 x regular single-ended 24w bulbs are sufficient for any models made 2015 onwards. NOTE: UVC bulbs included.