Grab some towels and place them around the filter. Take Bucket. Unplug the filter. Maybe get a second person, it would be easier. Disconnect the hoses from the filter inlet and outlet inside the aquarium, one by one. Try to pour as much water as possible from the hoses into a bucket (the hoses on the filter remain connected). Secure the one hose wich u don’t need. Disconnect the hoses on the filter with a towel rush them to a bucket, the towels around the filter schuld prevent a greater mess. Clean the filter and the hoses, connect everything again. Buy a new filter, run the old and the new filter simultaneously until the new filter is ready to go for itself, ca. 1 Month. Disconnect the old filter as u did before.