Article in English: Use a plastic liner that is 0.75 mm (0.029 in) to 1.00 mm (0.039 in) thick. Cover the entire sides and base of the pond with the liner.  Double the depth of your pond and add this number to the length and width of the pond to determine the length and width of liner that you need. For example, if your pond is 10 ft (3.0 m) by 10 ft (3.0 m), and 2 ft (0.61 m) deep, then you need a piece of plastic that is 14 ft (4.3 m) by 14 ft (4.3 m). The plastic will act as a moisture barrier, as well as provide something for the concrete to grab onto. Turn on your electric mixer and pour in the correct ratio of concrete to water. Wait until it is thoroughly mixed and there are no dry spots to start pouring it.  You can use an online concrete calculator to enter the dimensions of your pond and the thickness of the concrete you want to pour to determine how many bags of concrete you will need to complete the project. The type of electric concrete mixer to use is a small drum on wheels that tilts back and forth on an axis. When you plug it in and turn it on, the drum rotates to mix the concrete together. If you don’t have an electric mixer, or your pond is very small and you don’t need a lot of concrete, then you can mix the concrete in a wheelbarrow with a shovel. Start with one side of the pond and work your way around. Pour the mixed concrete onto the sides and base and even it out with a shovel until there is a 4 in (10 cm) layer covering all sides.  Make sure that the concrete is not too watery or it will run down the sides of the pond when you pour it on them. If you notice this happening, then reduce the amount of the water in the mix. You can spread the concrete out with a long rake with tape over the tips so that you don’t have to get into the pond to spread it. If your pond is too deep to reach the bottom with a rake or shovel, then carry buckets of concrete down to the bottom. Start at one end of the pond, and spread the concrete out evenly with a shovel or rake, working backwards, until you reach the other end and...

Summary in Indonesian:
Lapisi kolam dengan lembaran plastik tebal. Aduk semen di dalam mikser semen listrik sesuai instruksi pada kemasannya. Semenlah bagian dinding dan dasar kolam setebal 10 cm. Tekankan wire mesh (atau kawat ayam) ke dalam semen basah. Tutupi wire mesh dengan selapis adukan, lalu haluskan dengan sendok semen. Tutupi kolam dengan lembaran plastik dan biarkan semen mengering selama tiga hari. Semprotkan pelapis karet untuk melapisi permukaan kolam kalau hendak digunakan untuk ikan.