![Saving Solution](https://cole-tpomag.imgix.net/https%3A%2F%2Fwww.tpomag.com%2Fuploads%2Fimages%2Fs5000403.jpg?crop=focalpoint&fit=crop&fp-x=0.5&fp-y=0.5&h=620&ixlib=php-1.1.0&q=75&w=1024&s=c8fd409f34b671bbc4f3be25ab29f700)
The Eastsound Sewer and Water District operates a small (15,000 gpd) recirculating gravel filter system on Orcas Island, Wash. — one of two treatment facilities that serve separate small communities.
When the filter became plugged with sludge after many years through the normal...