There are two main types of water purifiers available in the market- gravity based and UF purifiers. Both have their own advantages and disadvantages. Let's take a closer look at each type: Gravity based water purifiers work by using gravity to draw the water through a filter. This type of purifier is usually cheaper than UF purifiers, and is good for removing sediment and other large particles from the water. However, it does not remove smaller particles or viruses, so it is not as effective at purifying the water. UF water purifiers use ultra-violet rays to kill bacteria and other microorganisms in the water. They are more expensive than gravity based purifiers, but they are more effective at purifying the water. UF purifiers are also good for removing small particles and chemicals from the water.