Stefani Ceramic Water Filters Float controls the water level in the lower chamber ensuring that the Stefani Ceramic Water Filter does not overflow. If the water in the Filter starts overflowing the Float could have a small piece of charcoal blocking it . Inspect the Float and blow it out to dislodge the charcoal. It could also be damaged through over tightening or having been knocked when the top chamber is removed from the bottom. In these instances the float should be replaced. The float is designed to fit below the filter candle.