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no not over filled say 130kg sand or 105 glass/zeo. i put in 105 glass and its at about 2/3. im going to try silicon sealant inside the housing as the puul shop guy said the oring seems ok. if that doesnt work im going to just get a davey filter. have to scoop out the glass and put it in buckets to get to the course glass at the bottom though so going to be funYou haven’t over filled it maybe? An overfilled sand filter will backup and over pressure in no time. Typically they are filled to arround 2/3, to where the walls start to tapper back in.