Aquarium Automation: The Theiling Rollermat and Other Web-Filtering Technologies

The Theiling Rollermat

The Theiling Rollermat

The problem

For the longest time, I have been trying to lengthen the maintenance interval for the filter socks on my 450-gallon system, which currently clog every two days. I tried eliminating filter socks completely for a period of time, but the sump got extremely messy and turned into a nitrate bank. The next option was to try 200-micron-mesh socks, which did help extend the replacement period, but they did not polish the water as well and eventually still clogged over a period of time.

The solution

Following my mantra to automate my system as much as possible, I looked into the Theiling Rollermat. It works by collecting overflow water that is gravity fed into the chamber and forcing it through the fleece to exit the sump, which is located in the center of the rolling web cage. After reviewing the specifications and checking the experiences of others who adopted it a year earlier, I believed this was the next step.

The Theiling Rollermat initially comes with a shorter roll than the normal replacement 6” wide x 147’ long filter fleece roll. A bulkhead adapter kit will also need to be purchased to convert the metric bulkheads to match the SAE PVC tube sizes. The Theiling Rollermat can handle an input flow rate of ~ 700 gph, and the output is just gravity fed back into my main sump. The only electrical parts were a float switch attached to a small geared motor, which spools incrementally the dirty web as the web clogs and raises the water level.

The Theiling Rollermat provides mechanical filtration with longer intervals between maintenance

The Theiling Rollermat provides mechanical filtration with longer intervals between maintenance

With a 450-gallon system, and many large tangs and rabbitfishes contributing to the detritus buildup, this device sounded like the answer to my problem. Unfortunately the cost was still a barrier at ~ $400 per unit. Fortunately, during a recent Black Friday sale, I was able to justify the investment at the lower cost of entry.

Installing the system would be easier if it were being designed into a new system. The downside to adding this to an existing system is space. The optimal position may not be available near the sump, and re-plumbing the system is not always straightforward with the location available. Tuning the water flow to fill and drain after a power outage will also take a few trials, depending on the unit placement, the type of overflow, and how you plumbed it.

In terms of positioning and plumbing, installation of the Rollermat is entirely dependent on your system

In terms of positioning and plumbing, installation is entirely dependent on your system – and that happens to be the most diffucult part of the Rollermat addition

After four months of running, I can say it was worth every penny, especially during my last two business trips. Each full replacement roll lasted ~ two months. Washing and reusing the dirty web is doable but may not be worth the hassle of unwinding, hosing off, washing, and rewinding 147 feet of web. It took a lot of time and effort, and the web may be degraded a little after running it through the washing machine.

I have tried to look for lower-cost fleece alternatives online (like coolant filter paper) but have not found any that were comparable or easily available for order without placing custom orders. The only other maintenance that may need to be done is just siphoning any detritus that ay not have been drawn into the web and settled on the bottom of the Rollermat cavity.

The verdict

In summary, I think this was a great addition to my system, but I can definitely see it is not needed for everyone or every system. If you are always home and able to perform the required filter sock changes, then this is not worth the cost. Much will depend on the value of your time and how much you depend on others while away. As more competitive web-filtering products appear on the market, hopefully the prices will drop and they will be more readily adopted and standardized since these greatly reduce the workload of maintaining large aquariums.

The filter fleece rolls, which capture a lot of detritus and waste, are replaceable and last for approximately two months

The filter fleece rolls, which capture a lot of detritus and waste, are replaceable and last for approximately two months

It definitely kept the system water quality more stable by keeping the detritus out of the water, made the hobby more enjoyable by reducing my stress, and, most important of all, made my wife’s life easier when I was away.

Photo credit: Ellery Wong


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About Ellery Wong

Ellery is a mechanical systems engineer at a Fortune 500 technology company. He has professional automation experience in the automotive, appliance, printing and robotics industries, as well as over 25 years as a saltwater aquarium hobbyist. He currently maintains a 365-gallon SPS/LPS system while regularly traveling for work, which presents a variety of challenges he enjoys tackling.


  1. Definitely something to consider on a larger aquarium. Most of the large aquariums we care for carry similar challenges RE overworked mechanical filtration. This results in multiple monthly service visits to ensure good mechanical filtration or regular involvement from the aquarium owner in changing socks between visits.

    Will be following this product because on a large aquarium the price point seems like a smart investment considering the projected lifespan of a new aquarium installation.

    Thank you for your insight!

  2. Peter yang says

    Dear Ellery thank you much for your post, I currently have a 280 gallon system, all up 840 liter.
    And I am very interested in this item..

    However reading through the info’s on eBay it says it can only handle 600 gph water flow.

    With my 280 gallon tank I have a pump gph at 3500-4000. Yours should be only bigger, how is it that it works on your system? What’s your pump water flow. Thanks much for your help

    • Ellery F Wong says

      Hi Peter,
      The vendor normally recommends scaling it based on Total turnover/700 gph = # of units you need to buy. But I can’t afford multiple units at the MSRP.

      The way I plumbed my system was so that not all of my overflow goes through the Roller mat. The other part is diverted to another sump which has the KLIR 4″ web filter. I run 6 tanks all connected to a single system with 2 sumps, 2 skimmers, 2 web filters, 3 return pumps (Reeflo Dart for 125g/120g and RIO 3100 for 80g/40B, and Quiet One 300 for the 12g/20g).

      Also I found a vendor on EBAY PreConFIlter to make me longer rolls of 100 micron filter paper that last me over 3-4 months for 300ft and I feed heavily. Just Specify 3″ core, 6

      • Ellery F Wong says

        Oops pressed the button too soon…
        Vendor: Precision Converting LLC

        Min order was 4 rolls @ ($28.86 x 4 plus $15.03 shipping/handling)*Price was when I last ordered 9/2018.

        Here were the specifications:
        1. Core Size = 3″
        2. Roll Width = 6 3/16″
        3. Roll Length = 100 yds
        4. Material = PreCon 100 micron

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