Step 15: Installation and Rationale
To install the rain barrel, you just have to place it on two cinder blocks (bare minimum, can stack many more), measure the height of your downspout adapter to the downspouts on your house, trim your house's downspouts to meet the barrel adapter, then slide the adapter over your downspout. Hook up garden hoses to the spout and overflow adapter and the barrel is ready to go.
Using the downspout adapter, multiple barrels can be linked together. Some people design their rain barrels with the downspout adapters at the bottom. The downspout adapter is placed at the top of the barrel in order to allow one barrel to completely fill up before filling the next one. This creates the water pressure that will push water through your hose.
I do not use a screen in my barrels because I designed a closed system rain barrel that will prohibit mosquitos from entering the barrel once everything is hooked up properly. You can clean the barrel by turning it over and spraying it with a hose. If you need a screen, you can cut out a piece of window screen and sandwich it between your barrel and your downspout.