The best way of preventing lead poisoning in children is to ensure that their home environment is free of lead. Parents should also aim to keep small children from chewing metal items such as keys, fishing weights, curtain weights and other metallic household objects. Lead paint is the most common source of lead poisoning in children, and is common in houses built before 1978. DIY testing kits are available to check the level of lead in painted surfaces in your home. If lead paint is present, special techniques may be used to remove it, or it can be painted over. Water is also another source of lead poisoning, although it can be easily removed by applying a lead filter to faucets. Important steps for preventing lead poisoning from food include washing all fresh produce before eating and avoiding foods canned outside the US.