pH adjusters are substances used to modify the acidity or alkalinity of a solution. They help maintain the desired pH level in various applications, such as agriculture, swimming pools, and water treatment. Common pH adjusters include citric acid, sodium bicarbonate, and sodium hydroxide, each serving specific purposes depending on the context. In agriculture, pH adjusters can improve soil conditions for better plant growth by ensuring nutrients are available. In swimming pools, they help keep the water safe and comfortable for swimmers by preventing irritation and equipment damage. Proper pH balance is essential for optimal performance in these areas.