If you own a Red Sea ReefMat 1200, replacing the fleece roll regularly is one of the easiest ways to maintain excellent water clarity and reduce maintenance in your reef aquarium.
In this guide, we'll cover when to replace your fleece roll, how often changes are needed, and how to choose a compatible replacement roll for your ReefMat 1200.
What Is the ReefMat 1200?
The ReefMat 1200 is Red Sea's largest automatic roller filter, designed for medium to large marine aquariums with high bioloads.
Instead of traditional filter socks, the ReefMat automatically advances fresh fleece material when the current section becomes clogged. This helps:
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Remove suspended waste before it breaks down
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Improve water clarity
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Reduce nitrate and phosphate buildup
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Minimize manual maintenance
When Should You Replace Your ReefMat 1200 Fleece Roll?
The fleece roll should be replaced when:
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The roll has been fully consumed
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The fleece becomes damaged or torn
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Water bypasses the fleece media
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The roll no longer advances properly
Most reef keepers replace their fleece every 4–12 weeks, depending on:
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Aquarium size
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Fish population
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Feeding frequency
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Maintenance routine
Heavy-stocked systems typically consume fleece faster than lightly stocked reefs.
Signs Your Fleece Roll Needs Replacement
Common indicators include:
Reduced Water Flow
Dirty or exhausted fleece can restrict water movement through the filter.
Frequent Roll Advancement
If the motor advances much more frequently than normal, the fleece may be nearing the end of its lifespan.
Visible Debris Accumulation
Excessive waste trapped on the fleece is a sign that replacement may be due.
Water Clarity Decline
Cloudy water can indicate reduced mechanical filtration performance.
Choosing a Compatible Replacement Roll
When selecting a replacement fleece roll for the ReefMat 1200, consider:
Proper Dimensions
A compatible roll should match the original specifications to ensure smooth operation.
Consistent Material Quality
High-quality non-woven fleece provides reliable mechanical filtration while maintaining water flow.
Roll Length
Longer rolls generally provide:
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More filtration media
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Longer service intervals
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Better overall value
FMD Replacement Rolls for ReefMat 1200
Filter Media Depot offers replacement fleece rolls designed for compatibility with the ReefMat 1200.
Key Features
✅ Premium non-woven fleece
✅ Consistent mechanical filtration
✅ Smooth roll advancement
✅ Longer-than-OEM roll length
✅ Excellent value compared to original replacements
Installation Tips
To maximize performance:
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Remove the used roll completely.
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Clean any accumulated debris from the roller assembly.
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Install the new fleece roll according to the ReefMat manual.
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Ensure proper alignment before advancing the fleece.
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Verify smooth movement during the first few cycles.
A clean installation helps prevent tracking issues and extends roll life.
Frequently Asked Questions
Are compatible fleece rolls safe for reef aquariums?
Yes. High-quality non-woven fleece is designed solely for mechanical filtration and is commonly used in marine aquarium applications.
Will a compatible roll fit the ReefMat 1200?
Compatible rolls designed specifically for the ReefMat 1200 should install and operate normally when manufactured to the correct dimensions.
How long does a fleece roll last?
Most hobbyists report anywhere from several weeks to several months depending on tank conditions.
What micron rating is the fleece?
Roller-filter fleece works differently from rigid filter media, so micron ratings should be treated as a reference rather than an exact measurement. Our fleece is generally considered comparable to approximately 100–150 micron mechanical filtration.
Final Thoughts
Regular fleece roll replacement is essential for keeping your ReefMat 1200 operating efficiently. By replacing worn media before performance declines, you can maintain clearer water, reduce nutrient buildup, and spend less time on routine maintenance.
Whether you're running a mixed reef, SPS system, or fish-only aquarium, choosing a quality replacement fleece roll helps keep your filtration system performing at its best.
Related Articles
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How Often Should You Change Roller Filter Fleece?
Recommended Product
Fleece Roll 17035 – Compatible with Red Sea ReefMat 1200
Premium non-woven fleece • 35m roll length • 2 rolls per pack • Ships from the USA.