One bucket holds the water and the other one (clear container on top) holds the plants that are in pots. The water stays in the bottom bucket till the pump turns on. the pump moves water up to the top clear tub and waters the plants. There are 2 lines in the top tub ones for the pump to bring water to the plants and the other one is there for the over flow. This will keep it from going all over ur house floor.
All u have to do is build what i have show u and put ur plants in pots filled with hydrotun and 1" rock wall cube and ur done. U dont even have to use hydrotun, u can use perlite too, but i wood get the Big and Chunky kind that way it can stay in the pot better.
Please read Al. B's 2 week harvest it will make u understand. If u read this thread u will understand everything im telling u. Its tells u everything about flood and drain systems, what to use as medium, and how to use the system.
If u have already read it then u need to read it again so when u ask ????? u know what u are talking about
Read first then ask ?????????????????