View Full Version : filter media

9th Sep 2008, 02:42 PM
hello all what would be a good combination of filter media for keeping low nitrate levels ?

9th Sep 2008, 09:24 PM
nitrates require anerobic conditions to be broken down
alternatively some way of outgassing as a nitrogen gas

these conditions are generally accepted to not occur in your average hobby filter and therefore water changes or plant utilisation of nitrate are the controlling factors

some trickle filter , inspite of being highly aerobic are climed to allow outgassing of nitrogen, there was some more information amongst the pond keepers forums