When installing a pond on your property, the water feature creates a small ecosystem that requires careful planning of every detail. Even the bottom material—known as the substrate—plays a significant role in the health and longevity of the pond. If you are trying to decide whether sand or gravel will work better for your installation, here is a brief guide to help you make a decision.

Why Does the Substrate Matter?

The substrate of the pond is a home for many microorganisms that clean the water. A healthy colony will break down waste and other detritus so that the water always looks clear. The substrate is also a place for water plants to root and will keep the bottom soil layer from washing out. Ponds with liners will benefit because the substrate adds weight that holds the material in place.

How Does Gravel Benefit a Pond?

Porous gravel makes the perfect home for microorganisms. The loose material allows water to flow between each rock, making it easier for aerobic bacteria to filter it. These passages also facilitate oxygen exchange throughout the pond to sustain the bacteria colony.

Gravel also benefits the pond’s structure. It’s stackable, allowing you to create heavier areas to hold the rubber liner down. This is significant if the ground swells beneath the liner, as the force can alter the pond’s shape. Additionally, you can build higher shelves around the rim for shallow plants to root. This material will add a beautiful look beneath the water’s clear surface, which is ideal if you want to mimic a natural pond.

What Are the Advantages of Sand?

Like gravel, sand is heavy and natural, which benefits the aesthetic and form of the pond. However, this material is smoother, so algae and pond scum won’t catch and stick to it, maintaining the overall appearance. The smooth surface is also easier to clean and replace, as you can scoop it out quickly.

Water and oxygen easily pass through sand, so you can count on a healthy amount of pond bacteria. Sand also doesn’t contain any chemicals that could contaminate the pond. However, purchasing a fine filter for your pond pump is necessary to prevent small sand particles from clogging the pipes.

Whichever material you choose, turn to LaSalle Sand & Gravel for your purchase. Based in Kalispell, MT, this company has been providing high-quality materials and land clearing services for over 15 years. They support residential and commercial projects. Call (406) 756-9070 to speak to a team member about their gravel, washed stone, and landscaping rocks options.