My personal choice for pond liner is EPDM rubber. It’s what Ive used on all my ponds.
I have also used HDPE, that was on my grey water wetland.
If you are going to construct an ecosystem pond with rocks and pebble I would certainly stick with EPDM rubber.
HDPE and LLDPE are more rigid, but I think they are a perfectly fine choice for a small fish pond, with no rock and pebble.
You might also like to view geotextile underlayment to protect your liner.
There is a calculator below that can help you work out how much you need.
If you are in Australia click here for my local supplier.
EPDM Pond Liner
- Highest quality
- Highly durable
- Used by most professionals
- 45 Mil
- Available in many sizes
- Easy to repair and join
- UV resistant
HDPE/ LLDPE Pond Liner
- Cheaper again
- Highly durable
- Tear and puncture resistant
- Available in many sizes
This calculator is for the pond only, if you are adding intake bays and bog filters you’ll want to consult with the pond formulas blueprint.