"This filter uses sand as a bacteria settlement media. In a tubular design, sand is fully submerged in water. The water is pumped upwards through the sand, allowing bacteria to settle within. Additional tubes can be used as pre-filters (mechanical) and also for chemical filters. This filter provides a large surface for bacteria colonies, but sometimes lacks in providing enough oxygen for optimum performance."
Got this off of algone.com. I was curious myself like you I started having fantasies of a filter for aquarium sand. lol. No more python and tedious vacum. So I googled it and voila! T1KARMANN just wondering how effective is this thing in your personal experience? I'm imagining you've run one in the past. Is it more of a water polisher or more biologically beneficial?