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What did you mean by type? is it the material or the manufacturing method??
In deep well systems, a piping loop extends several hundred feet underground.
Shallow loops are placed in long trenches, typically about6 feet deep and several hundred feet long. Coiling the piping into a "slinky" reduces the length requirements
For homes located on large private lakes, loops can be installed at the bottom of the lake, usually decreases the installation costs and may improve performance.