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Total Pond Seaming Tape$25.98
The Seaming Tape will allow you to connect and seal two or more pieces of PVC or EPDM liner together to create a bigger pond. Use this waterproof adhesive to connect pond underlayment as well. This durable seaming tape is safe for fish and plants and is designed to resist cracking.
With this small advantage there really is no limit to how big your pond can be.