They are 1m deep and can be folded to create sizes up to 1.9m in diameter. (See diagrams below).
If installed in a circular pit, the diameter measures 1.9m when fully extended, but the membrane can easily be folded, to create smaller sizes, as required.
If installed in a square pit, the membrane will measure 1.5m on each of the four sides. Naturally, it can be folder to create smaller sizes, or installed in a rectangular pit.
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