LifeGuard Pond Liner 5 ft x 35 ft 45 Mil EPDM Rubber - Durable, Fish

In this review of the LifeGuard Pond Liner 5 ft x 35 ft 45 Mil EPDM Rubber with UnderGuard underlayment, the bottom line is simple: this kit is for anyone building a small to medium pond, water feature, or koi area who wants a thick, long-lasting liner that is certified safe for fish and wildlife. The reviewer found the material noticeably thicker and more pliable than thinner consumer liners, and the limited lifetime warranty plus the geotextile underlayment make it a practical choice for installations where puncture resistance and handling during shaping matter most.

Key Features

• 45-Mil EPDM Rubber: Provides a thick, flexible membrane that lays flat and resists tearing during shaping and installation.
• UnderGuard Underlayment: Geotextile backing cushions the liner against rocks and roots and is supplied in pieces equal to the total square footage for coverage.
• Certified Fish & Wildlife Safe: The liner is certified safe for aquatic life, making it suitable for koi ponds, aquaponics, and fish hatcheries.
• No Plasticizers: The formulation avoids plasticizers that can become brittle, helping prevent cracks and long-term splitting.
• Limited Lifetime Warranty: Backed by a limited lifetime warranty, offering buyers extra confidence in longevity and material performance.
• Versatile Use: Intended for waterfalls, retention basins, stream liners and lakes, delivering broad applicability for outdoor water projects.

Who It's For

This liner is best for homeowners, landscapers, and hobbyists installing small to medium ponds, water gardens, or waterfall features who need a durable, fish-safe membrane that is straightforward to shape and install. Its thickness and included underlayment make it particularly appropriate where sun exposure and contact with rough substrates are concerns.

Those who should look elsewhere include installers needing a custom-fit liner for very large commercial reservoirs where sheet seams and handling logistics demand specialized service, or users who require a lighter, temporary liner for short-term seasonal features.

Pros & Cons

Pros

• Thick 45-mil material provides strong puncture resistance and durability during routine outdoor exposure.
• Included geotextile underlayment helps protect the liner and simplifies installation over uneven ground.
• Certified fish and wildlife safe, suitable for koi, aquaponics and hatchery use.
• Easy to shape and lays flat, which reduces installation time for small features.

Cons

• Heavier weight makes handling alone more difficult and may require extra hands for larger pieces.
• Underlayment may arrive in multiple pieces rather than a single sheet, requiring alignment during installation.

Specifications

Material	45-mil EPDM rubber
Size	5 ft x 35 ft
Underlayment	UnderGuard geotextile (total coverage in multiple pieces)
Warranty	Limited lifetime warranty
Fish Safety	Certified Fish & Wildlife Safe
Use Cases	Ponds, waterfalls, koi ponds, aquaponics, retention basins

Our Verdict

The LifeGuard 45-mil EPDM pond liner is a solid value for homeowners and hobbyists who want a durable, fish-safe membrane that is easy to work with and backed by a limited lifetime warranty. It excels where puncture resistance and material longevity matter, though the heavier weight means planning for extra hands during installation.

Frequently Asked Questions

Is this liner safe for koi and other fish?
Yes. The liner is certified Fish & Wildlife Safe and is suitable for koi ponds, aquaponics and hatcheries.

Will the underlayment come as one piece?
The geotextile underlayment is provided in pieces equivalent to the total square footage, so expect multiple sections that must be aligned during installation.

How difficult is installation for one person?
The material is pliable and lays flat, but the 45-mil thickness makes it heavy; having an extra person for handling larger sections is recommended.