While it is pretty common to use Infra Red (IR) filters for IR photography, there is yet another, braver and non-reversible way to do it – remove the IR filter that’s placed in front of the CCD.
The reason for removing the internal IR filter rather than using an IR lens filter, is that you get way (WAAAY) more infra red light to hit the sensor. On the down side, you will be doing a non-reversible, non-refundable, warranty-voiding surgery on your camera. So: A – you must really love infrared photography and B – you do this at your own risk. If you kill your $28 camera don’t come crying, you knew this was an option.