If you’re researching wetland (bog) filters with bioballs, you’ve probably seen videos or articles about using bioballs instead of gravel. Some contractors — and even homeowners — are experimenting with this approach. At Aquascape Creations, we’ve tested it ourselves, and while the results have been encouraging, there are key factors you should understand before considering it for your koi pond or recreation pond.
Bioballs vs. Gravel: The Cost Factor
The purpose of gravel in a wetland filter is to provide massive amounts of surface area for beneficial bacteria to colonize. These bacteria are the true workhorses of natural filtration — breaking down fish waste, excess nutrients, and organic debris.
Here’s the challenge:
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A couple of feet of gravel layers offer an enormous surface area at a relatively low material cost.
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To match that same biological surface area with bioballs, you’d need thousands of them — and the price adds up quickly.
So while bioballs are lightweight and easy to install, the material cost is significantly higher compared to decorative rock or gravel.
When Bioballs Might Make Sense
In some Bay Area projects, excavation and soil disposal costs are a major factor. Since bioball-based wetlands require less digging than traditional gravel-filled wetlands, the approach can make sense where hauling away soil is expensive or logistically difficult.
What’s Coming Next: Aquascape’s New System
Recently, our team attended an industry event and got firsthand insight into a new wetland system Aquascape is currently developing, scheduled for release in 2026. Unlike simply swapping bioballs for gravel, this system is being engineered with specific components designed for bioball-style wetlands.
They’re also redesigning the snorkel vault and centipede modules to optimize performance. As contractors, we’re excited about this innovation — and once it becomes available, we’ll test it in the field, measure costs, and share results with our Bay Area clients.
Our Recommendation for Now
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Gravel wetlands remain the most cost-effective and proven option today.
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Bioball wetlands are an emerging method that may be beneficial in certain projects with soil hauling limitations.
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New systems are on the horizon, and we’ll be among the first to try them once available.
At Aquascape Creations, we stay ahead of new filtration technologies so we can provide our clients with the best balance of cost, efficiency, and long-term performance.
Stay tuned — we’ll update this blog in 2026 once we’ve tested the new system and have real-world results to share.
