If you are building a pond for the first time, you should check out this video on youtube. Then you might consider purchasing a kit, which will include everything you need to start the process. This is usually the best way to start a project because you know that all of the included parts will work together and fit together correctly.
If you are building your own, you will need to put down a layer of sand before you install the underlayment and liner. You will have to buy a pump, which will move the water around and support any fountains or waterfalls you want to install. You can buy a submersible pump, which works well for smaller ponds, or you can buy an external pump. You will have to spend more up front to buy an external pump, but it will be cheaper to run because it uses less energy that a submersible pump.
You will have to purchase a filter to keep your water healthy and clean. Some filters are submersible, so they actually run under the water. A pond skimmer will also keep the water clean. It works by collecting dirt and other debris from the surface of the water, which helps ensure that debris doesn’t fall to the bottom.
One item you should consider purchasing is a cover. You can order a cover in custom dimensions in just about any shape to fit whatever size you have. A cover is great because it protects your water. Debris can’t get in, but sunlight can still reach the water.
The last thing you should consider is buying a test kit for your water. A test kit will check the ph balance in your water and the levels of phosphate, ammonia, and nitrite to make sure you have a healthy environment for your fish and other aquatic life.