Plumbers have a number of devices to unblock drains starting with CCTV cameras to pinpoint the location of the blockage. Plumbers often use a snake, which is a long flexible steel rod with cutters, great for stubborn blockages or tree roots. These do however have limited reach so plumbers may also use powerful hydro-jet devices which send high-pressure forces of water to unblock drains. If the problem is more significant, plumbers may need to replace drainpipes altogether.