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Custom Pro EPDM Pond Liner & Protective Underlayment Combo Kit

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  • Includes 45 mil EPDM pond liner and heavy duty pond underlayment of the same size.
  • For koi ponds, water gardens and pondless water features.
  • Premium pond liner has a lifetime manufacturer warranty and is made for the toughest applications.
  • Underlayment increases the liner's puncture resistance by over 400%
  • Liner and underlayment can be trimmed easily with scissors.
  • Safe for fish and aquatic plants. Made in the USA!

Liner Calculator

Enter the largest measurement for each dimension. If you're digging your pond to be 10 feet wide on average, but there is one section that measures 12 feet wide, please use 12 feet as the width.
Liner is manufactured in widths divisible by 5. Therefore, our liner calculator always rounds up the width to the nearest multiple of five.


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The Custom Pro 45 mil EPDM Pond Liner and Underlayment Combo Kit is simply the best sold anywhere! When compared to inexpensive polyvinyl chloride (PVC) and other economy pond liner, this kit's 45 mil thick EPDM premium pond liner is in its own class. The pond liner even has a lifetime manufacturer's warranty!

The heavy duty underlayment is designed to protect the pond liner from sharp rocks as well as roots and burrowing animals. Acting as padding, it increases the pond liner's puncture resistance by more than 400 percent! Place the underlayment between the soil and the pond liner.

Both the liner and underlayment are black. The pond liner appears silvery because it has a coating of white talc powder to keep it from sticking to itself when folded or rolled.

PLEASE NOTE: Because we are an outdoor facility, your liner may arrive with some minor dirt/dust markings from rain splashing, however we guarantee it is brand new and never used!
ATTENTION: The 15'x25' and 20'x20' liner-underlayment combinations each ship in 2 boxes due to size.