This is a filter for a pond or a fish tank. The original design I did works fine however it was too small resulting in having to change the filter every day. This one is larger so it can hold more filter material. It should last the week before you have to clean it.

dimensions are 80 cube with 4mm walls. Extra 4mm lip to help hold in the filter material. The connector has a 12.5mm radius so it will fit a 25mm hose.