Step 4: Once the pond is level make sure that it is centered in the hole begin filling with water and backfilling.Make any adjustments needed to obtain perfect leveling. Set the pond shell in the hole and check the level of the pond itself. Step 3: Level and pack the bottom of the pond and shelves cover with a 2 inch layer of sand. If the pond has a grass edge surrounding it, leave the level of the pond above the surrounding surface at 1 1/2 inches so the lawn drains away from the pond. Finish digging the soil adding 2 inches to the depth for a cushioning layer of sand. Slant the surface where the edging is to be approximately 1 inch per foot away from the pond. Shelves should be dug 2 inches deeper than the actual shelf to allow for a cushion of sand. If edging other than grass is to be used, excavate this area as well. Dig down first to the level of the shelves (if any). Step 2: Begin digging soil from the center of the pond outward ( Figure 2).It is better to add fill to the low side than to cut the high side. Use wooden stakes to mark the desired level and then carry that grade around the pond. At this point use the top soil removed to level the area that is to be the rim of the pond. Lay out enough plastic to hold all of the excavated soil (,a href=”fig1.html”>Figure 1). Further, add enough distance to the area of turf removed for the addition of edging material if any is to be used. Add about 2 to 4 inches to the width of the pond outline for room to add and tamp the back fill ( Figure 6). Remove the pond shell to a safe distance. Once you select a fiberglass shell it is too late to change its shape. Outline this area in the same shape and size as the pond shell with a garden hose or rope. Step 1: Place the pond liner in the spot where you want the pond.To read more about either type of liner, please see our pages on fiberglass liners, plastic liners, or box-welded liners. To learn more, please see the box-welded liner in store. A potential downside is that they are usually a variation of a rectangular or square shape. The advantage of our polypropylene is that is is strong, light and safe for fish, plants and human. Box-welding is the process of taking a flexible liner (we like polypropylene), and using heat welding equipment to melt multiple panels of liner together to create a shape. A third option that won't crack like plastic, but is less expensive than fiberglass is a box-welded liner. However, as a downside, fiberglass is MUCH more expensive to buy and ship since they are heavy and large. Fiberglass liners are also much tougher than plastic liners, and can handle more abuse before damage and leaks will occur. In contrast, fiberglass liners need no confinement whatsoever and can even remain freestanding on the ground while filled with water. Plastic liners are less expensive than fiberglass liners or box-welded liners, but must be fully confined inside the ground to prevent the liner from flexing, and as a result, cracking. In general, there are three common materials available for preformed ponds: rigid plastic, fiberglass and flexible liner that is box-welded to create a certain shape. However, that being said, you could always start small in the beginning and then build a second or adjoining pond later. If you do decide to go with a preformed pond liner, and would like to leave your options open for the future, try to get the deepest pond you can, with a volume of water in excess of 1000L since larger volumes of water react slower to temperature changes. The problem with many rigid pond liners is that often times they are simply too shallow to properly control the water temperature for fish. Over time, you may desire a more advanced pond, such as a koi or goldfish pond. However, like many other hobbies, pond keeping can slowly enthrall a person. If you're the type of person who is good with planning, then this may not be a problem. The main disadvantage of preformed pond liners is that once you buy a liner, your pond design is set in stone and can't be changed without purchasing a new liner. However, to be clear, this isn't the case with all preformed liners since plastic liners require full confinement in the ground to prevent cracking. This means that a fiberglass pond can be installed above ground, and then later hidden with landscaping. Because fiberglass is quite rigid, the pond can be placed on the ground and filled with water straight away, with no other support necessary. In the case of using fiberglass preformed pond liners, an important advantage is the ease of installation.
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