Why Fiberglass Koi Pond Liners Are Often Best

Fiberglass koi pond liners are both versatile and strong. You can join them together to make a variety of shapes and sizes.

The preformed parts are made of durable fiberglass that has a UV resistant gel coating on the interior finish. This is the same material used to construct boats and other marine items. It is waterproof, sturdy and has a life expectancy of 30 years plus!

Fiberglass pond shells are easy to install. Just excavate, level the shell on 2″-3″ of sand base, install any plumbing you are going to need and then backfill around the pond.

Complete assembly and installation instructions are provided for you if you purchase a koi pond kit.
Fiberglass pond liners have several advantages over ponds with flexible liners, and even cement koi ponds, which are often considered to be the most permanent.

First, fiberglass lined ponds are not prone to cracking due to minor ground movements and settling like cement ponds are. They can also be safer for your koi since they are chemically inert and don’t cause changes to water chemistry and pH.

Unlike flexible liners, fiberglass is not subject to rim erosion and punctures, making it much sounder structurally. Thus it is a more permanent and durable solution.

It also resists root damage and sabotage from burrowing animals. These sometimes cause extensive damage to other pond lining materials.

In addition to this, fiberglass is much easier to repair in the event that it is damaged.

Although cement is the choice of many, and flexible liners are the least expensive, I personally favor fiberglass koi pond liners!

Alan Deacon
KoiCareBasics.com

Which Koi pond liners  are better;  rubber liners or a concrete pond?  Both have advantages and disadvantages.

When a concrete pond is designed and built correctly it can be more permanent. You need to be very careful when designing a concrete pond that you have planned everything properly because once installed it literally is “cast in stone”!

You can form the shape and contours so that they are very smooth and even which is a must to avoid “dead areas” in your Koi pond.

The biggest disadvantage with concrete pond is that because of all the exposed concrete the ph tends to be higher for at least the first three years. There are, however, things that can be done to prevent this.

One way is to let the concrete cure and then coat it with a rubber base paint or epoxy.

A 45 mil rubber liner pond  is not as permanent. Rubber liners also come in a variety of thicknesses, with the thicker liners being more durable but the thinner ones being easier to shape and mold.

This lack of permanence can be a benefit in some situations. If your pond ends up having some design flaws that need changing, or if you need to move or remove the pond, you’ll be glad you’ve chosen a rubber liner.

An additional advantage is that rubber Koi pond liners will maintain a more neutral ph.

Rubber liners also provide a softer surface for your Koi.

A disadvantage of rubber Koi pond liners is that even when the liner  is installed properly you will  still  have some minor folds in the liner. Once you fill your pond these folds will barely be visible.

Another challenge with a rubber lined pond is the rock work around the edges.  If you don’t want the liner to show it will be necessary to camouflage it with rock work and plants.

The challenge is that the rock work will need to extend down into the water but the mortar for the rock work won’t stick to the liner.

Even though a rubber liner is less permanent when it is properly installed it can remain leak free for many years.

Taking into account the pros and cons of each will help you to make your own decision about Koi pond liners!

Alan Deacon
KoiCareBasics.com