Most brands of laundry detergent are available in packet, tablet or pod form, including Arm & Hammer, Seventh Generation (which is eco-friendly), Tide, Gain, Purex, Swift, Salvo and Dropps. Tablets are filled with enough soap for one load of laundry, and they disintegrate in either hot or cold water.
Laundry detergent tablets are intended to make the chore of laundry more efficient, less messy and as convenient as possible. The directions are to place one laundry detergent tablet in the washing machine with the dirty laundry, and start the machine. In theory, this avoids the untidiness of powder or liquid soaps in the process of laundering and saves time measuring out soaps. There are some concerns as to the safety of these products around children and about possible negative environmental impacts, but those issues are addressed by most companies that are producing the product.
There are many "do it yourself" websites on the Internet that offer opinions and directions about creating laundry tablets at home in order to save money or to reduce the potential negative impact on the environment. Homemade laundry tablets can have fewer harsh chemicals and more natural ingredients.