The Algae Turf Scrubber (ATS) is a method of aquarium water purification that was patented by Walter Adey in 1992. With this patent Adey prevented others from building or developing ATS filters which effectively stopped any independent development or innovation of this method of filtration by the general hobby community. We are pleased to learn that this patent will soon expire as explained by this contribution from Sara Allyn Mavinkurve. Thanks for the write-up Sara!
by Sara Mavinkurve, written exclusively in her capacity as an aquarist, and for entertainment purposes only