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Which Pond Liner is Right for You?

Combos include underlayment that protects your liner and extends the warranty.


Shop 45 mil EPDM

45 mil EPDM Liner Flexibility
Durability
Warranty
Price
Make It a Combo

Shop 60 mil EPDM

60 mil Pond Liner Flexibility
Durability
Warranty
Price
Make It a Combo

Shop 20 mil PVC

20 mil PVC Liner Flexibility
Durability
Warranty
Price

Make It a Combo

Shop LLDPE

20 mil Poly
Flexibility
Durability
Warranty
Price

Shop LLDPE

Need help sizing your pond liner?

We have calculators and tutorials to help you design your pond and pick out the correct products for your project.

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Frequently Asked Questions

What size liner do I need?

The formula for sizing a pond liner is
POND LENGTH + (2 TIMES DEPTH) + 2' = LINER LENGTH
POND WIDTH + (2 TIMES DEPTH) + 2'= LINER WIDTH

Example:
A 12' long, 7' wide and 3' deep pond is...
12' + (2 * 3) +2' = 20' Long
7' + (2 * 3) + 2' = 15' Wide

How many gallons is my pond?

The formula for determining the number of gallons is:
FOR SQUARE AND RECTANGULAR PONDS
Length * Width * Depth * 7.5 = Gallons


FOR ROUND PONDS
RADIUS * RADIUS * 3.14 * 7.485 = Gallons

Example:
12 * 12 * 3.14 * 7.485 = 3,384 Gallons

Underlayment for Pond Liner

Consider Adding UnderGuard Geotextile Underlayment

UnderGuard Geotextile Underlayment™
The biggest contributors to Koi pond, water garden and waterfall failures are poor, unstable soil conditions. Nonwoven geotextile fabrics are perfect for stabilizing soil, preventing rocks and roots from penetrating pond liner and for creating ’rock pads’ to cushion large rocks and boulders placed in the pond on top of the liner.
Underlayment is EASY to install
Underlayment is manufactured in 5’, 10’ 15’ widths and will ship to you in one or more pieces equal to the total square footage of the pond liner in liner/geo combo. Simply lay the pieces next to each other and install the pond liner. Use any extra underlayment to create pads for large rocks and boulders placed inside your pond.

Step by Step Support

Here at Half Off Ponds, we strive to work hard, so that it is easy for our customers to shop our store. We also provide tutorials and instructions for when you may need assistance. Repairing pond liner and running pipe through liner can be a little complicated, if you have never done it before. Check out our tutorial page for more information.