The items listed below are unigue for water features with no ponds, rain harvesting, and container gardens. The tanks are for the water capacity storage to run the features. The vault is for easy access to your pump for maintaining. The vault extension is used on the vault when you need to double layer your tanks.
You will need to go to the waterfall page and pick out your waterfalls unit you want to use for the without pond feature and rain harvesting installations.
You will also have to determine how much liner you need, The underlayment size has to be doubled as you will need a piece for under the liner to protect the bottom of the liner but you will also need a piece to go over the top of the liner to protect the liner from the edges of the tanks.