wlim glass filter development http://www.monsterfishkeepers.com/forums/showthread.php?426129-kendragon-s-cichla-filter-project
wlim bio glass filter is not listed on the website. Go to the wlimproducts website, the price is close to the bio wave filters. WLim Store is not owned or operated by wlim.
Can you post pix of the glass media? I'm curious to see what it looks like. Does it still require a blower to backwash? I would think it would be nearly as heavy as sand since that's essentially what glass is made of.