LifeGuard Pond Liner 20 ft x 100 ft 45 Mil EPDM Rubber - Durable Pond

In this review of the LifeGuard Pond Liner 20 ft x 100 ft 45 Mil EPDM Rubber and Underlayment Combo, the bottom line is clear: this liner is aimed at homeowners, landscapers and hobbyists who need a heavy-duty, fish-safe liner that holds up to heavy use and sun exposure. The single biggest reason to consider it is its thick 45-mil EPDM composition paired with geotextile underlayment and a Limited Lifetime Warranty, which together deliver long-term puncture resistance and flexibility for shaping waterfalls, ponds, streams, and larger retention basins.

Key Features

• 45-Mil EPDM Rubber: Provides thick, flexible waterproofing that resists punctures and stays pliable for shaping around features.
• UnderGuard Underlayment: Geotextile backing protects the liner from sharp substrate points and comes in pieces equivalent to total square footage for full coverage.
• Fish & Wildlife Safe: Certified safe for aquatic life, making it suitable for koi ponds, aquaponics and fish hatcheries.
• Plasticizer-Free: The material does not contain plasticizers, reducing the risk of brittleness and cracking over time.
• Easy to Install: The liner lays flat and is pliable enough to form into waterfall features and irregular pond shapes with minimal effort.
• Limited Lifetime Warranty: Offers long-term coverage that reflects the manufacturer confidence in material durability.

Who It's For

The LifeGuard 20 ft x 100 ft liner is best for backyard pond builders, landscape contractors, and aquaponics hobbyists who need a large, durable sheet to line ponds, streams, waterfalls and retention basins. Its certification for fish and wildlife makes it especially suitable for koi owners and small fish hatcheries concerned about material safety.

Those who should look elsewhere include buyers needing very small pre-cut liners for tiny containers or those who require lift-gate delivery included; this item ships via freight truck and lift-gate service is not included by default, so plan for freight logistics and ensure accurate contact information for delivery scheduling.

Pros & Cons

Pros

• Durability: 45-mil thickness and puncture-resistant EPDM deliver long-term performance in exposed installations.
• Fish-safe certification: Suitable for aquatic life and aquaponics installations without leaching concerns.
• Installation-friendly: Lays flat and is pliable enough to shape around waterfalls and features.
• Value for money: Customers report material quality and thickness feel better than many commercial alternatives.

Cons

• Weight and handling: The large size is heavy and may require multiple people or equipment to position safely.
• Delivery specifics: Ships by freight truck without lift-gate included, so delivery scheduling and handling preparations are necessary.

Specifications

Product type	45-Mil EPDM rubber pond liner with underlayment
Size	20 ft x 100 ft
Thickness	45 mil
Underlayment	UnderGuard geotextile (multiple pieces to match square footage)
Warranty	Limited Lifetime Warranty
Safety	Certified Fish & Wildlife Safe
Shipping	Freight truck (lift-gate not included)

Our Verdict

The LifeGuard 20 ft x 100 ft 45-Mil EPDM liner is a practical choice for anyone building medium to large ponds or water features who needs a thick, fish-safe, and puncture-resistant material. It represents strong value because of its material quality and warranty, but plan for the liner's weight and freight delivery logistics before purchase.

Frequently Asked Questions

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

Does the underlayment come as one piece?
The geotextile underlayment will come in multiple pieces equivalent to the total square footage to protect the liner across the installation area.

Does delivery include lift-gate service?
No. This item ships via freight truck and lift-gate service is not included, so you must arrange handling or confirm delivery options with the carrier.