Modern home owners appreciate the value and beauty of a garden pond. For many reasons, pond liners make these garden pools more efficient and easier to maintain. Pond liners are available for every size from small goldfish ponds to small lakes. The best lining materials are durable, flexible in any temperature, and friendly to fish and plants.
A natural product that makes good pond liners is a special rubber called EPDM. It is environmentally friendly and harmless to fish. When processed properly, it is resistant to weathering. Because it stretches, it is easy to form to the shape of the pond.
Make sure your rubber lining material is not treated with fireproofing or algaecide chemicals, which are found in similar products designed for roofing purposes. Forty five millimeters is a good thickness.
Medium density polyethylene is also used in pond liners. This synthetic material can be 20 or 30 millimeters thick. It is durable in a wide range of temperatures and resists damage from sunlight. In addition, it can be obtained fairly cheaply. The downside is that it carries only a one-year warranty, while the rubber products are warranted for 20 years.
Another material sometimes used in pond liners is PVC. These products, when 30 ml. thick and produced to support fish, are the most expensive of the materials mentioned here. They can be ordered in custom sizes, and run about forty-two cents a square foot.
When making ponds in areas where there are many sharp rocks in the underlying soil, it is wise to use a layer of underlay beneath the pond liners. These cushion the liner and protect it from being punctured by a stone or root. These add about 20 cents per square foot to the cost of your pond.
Very large ponds can require the use of splicing materials to join sections of the pond liners. The liner material comes in large rolls of varying widths. Large ponds can be lined by joining the edges of the liner with special tapes. There is also tape available for mending the liner if the need should arise.
There are some cheaper alternatives to pond liners, including sheet plastic and the plastic silo toppers you can get from farm supply stores. These have worked well for some people, especially for small ponds. However, since they are not designed specifically for a fish pond, some of these materials might compromise the health of the fish.