Laguna Powerflo Max underwater filters protect your pump from clogging and keeps water clean and clear. 2 chamber filter with 2 filter sponges prolongs time between cleaning. Plus added chamber with BioMax filter media for added biological filtration. Unique click fit connecor makes connection to different hose sizes, from 3/4 inch to 1 1/4 inch a snap! Easily connects to any pump with a 3/4 to 1 1/4 inch intake hose.