A water recycling shower is like a magic shower that doesn't waste water! Imagine you are taking a bath in a big bucket of water. Normally, when you are done with your bath, all of that water would get thrown away. But with a water recycling shower, the water is saved instead of thrown away.
The way it works is that the water you use for your shower goes down a drain, just like normal. But instead of going straight to the sewer, it goes through a filter that cleans it up. This filter takes out any dirt or soap that might be in the water, so that it's nice and clean.
After the filter, the water goes into a special tank that stores it. The next time you take a shower, the water from that tank is used again! And it keeps going like that, over and over.
This means that you can take a shower without wasting as much water as you normally would. And that's good for the planet because it means we can use less of Earth's precious water. So, it's like having a magic shower that saves water and is good for the environment!