LifeGuard Pond Liner 20 ft x 40 ft 45 Mil EPDM Rubber - Durable, Fish

In this review the LifeGuard Pond Liner 20 ft x 40 ft 45 Mil EPDM Rubber and Underlayment Combo is evaluated for backyard pond builders and small commercial aquatic projects. The bottom line: this liner is for anyone who needs a heavy, pliable, and fish-safe membrane that lays flat and resists punctures over time. Its single biggest selling point is the 45-mil EPDM thickness combined with an UnderGuard geotextile underlayment and a Limited Lifetime Warranty, which together offer long-term protection for koi ponds, water gardens, stream liners and retention basins.

Key Features

• 45-Mil EPDM Rubber: Provides thick, flexible protection that resists UV and weathering for long-lasting pond containment.
• UnderGuard Underlayment: Adds a geotextile cushion that reduces puncture risk from soil and rocks and will be supplied in pieces to match total square footage.
• Limited Lifetime Warranty: Gives confidence in durability and manufacturer backing for long-term installations.
• Fish & Wildlife Safe Certification: Certified safe for fish and wildlife, making it suitable for koi ponds, hatcheries, and aquaponics systems.
• No Plasticizers: Formulated without plasticizers that can become brittle and crack, improving longevity and flexibility.
• Easy to Shape and Install: Lays flat and is pliable enough to fit waterfall features and complex pond shapes with minimal effort.

Who It's For

This liner is aimed at homeowners building medium to large backyard ponds, landscape contractors, and small commercial aquatic projects such as fish hatcheries, aquaponics tanks, and stream liners who need a dependable, fish-safe membrane. The combo of EPDM and underlayment is also well suited to koi keepers who want extra puncture protection and material thickness for peace of mind.

Those with very small, temporary pond projects or installers who require custom fabrication services might look elsewhere; the product ships via freight truck and is heavy, so buyers should plan for delivery logistics and handling.

Pros & Cons

Pros

• Substantial 45-mil thickness offers strong resistance to wear, UV and sun exposure.
• UnderGuard geotextile reduces puncture risk and helps the liner sit smoothly over uneven substrates.
• Certified safe for fish and wildlife, making it suitable for live-stocked water features and aquaponics.
• Limited Lifetime Warranty provides long-term assurance of material integrity.

Cons

• Heavy material and freight delivery mean handling and accurate contact info for scheduling are required.
• Geotextile may arrive in multiple pieces rather than a single sheet, which requires careful placement.

Specifications

Product	45-Mil EPDM Rubber Pond Liner with Underlayment
Size	20 ft x 40 ft
Thickness	45 mil
Underlayment	UnderGuard geotextile (supplied in pieces equivalent to total area)
Certification	Certified Fish & Wildlife Safe
Warranty	Limited Lifetime Warranty
Shipping	Freight truck (lift-gate not included; accurate contact info required)

Our Verdict

The LifeGuard 20 ft x 40 ft 45 Mil EPDM liner is a robust, fish-safe choice for serious pond builders and koi keepers who want durability and puncture protection. Its thickness, UnderGuard cushion and warranty make it a solid value for long-term installations, provided buyers plan for freight delivery and handling.

Frequently Asked Questions

Will this liner work for koi ponds?
Yes. It is certified fish and wildlife safe and the 45-mil thickness provides durable protection suitable for koi ponds and aquaculture use.

How is the underlayment supplied?
The UnderGuard geotextile will ship in multiple pieces equivalent to the total square footage and should be laid to cover the pond footprint before installing the EPDM.

Does delivery include lift-gate service?
No. This item ships via freight truck and lift-gate service is not included, so a proper delivery plan and working phone number for scheduling are required.