Originally Posted by Jmunroe
On lower setting water flows through the filter spending more time in contact with the media to allow for cleaning... On higher setting water flows faster through the media not cleaning as much in a single pass but more water flows through it in the run of a day there by giving the same cleaning effect. That's how I always understood it worked. I stuff mine with floss as well as bio so I leave it on high to polish more water. That's the only difference I can see.
Thats pretty much it in a nutshell. More flow more GPH
hence more cleaning and a cleaner tank. More turnover is a good thing and we all want. Lower setting. Less GPH
, less turn over but you still get the same filtration effect. In the end I would strive for more turn over (GPH
) then your tank in gallons. Hope that made sense.