I believe many people have the hobby of raising goldfish, but it is a tiresome task to change the water and clean the dirt in the tank every few days. Two designers from the United States, Craig Wenger and David Turover, designed GravityFlow2, an automatic water-changing fish tank. From then on, raising goldfish no longer requires manual water changes.
They also designed similar products in the past few years and raised funds on Kickstarter, which received a good response, and GravityFlow2 is an improved version of the previous one. This automatic water-changing fish tank uses the principle of gravity flow, with a glass tube extending from the water surface to the bottom of the fish tank. When you need to change the water, you only need to pour water directly into the fish tank, and the dirt will be automatically patted out from the faucet along the pipe. The entire water change process is very convenient.
