Hi folks, Thought this data might be of use to someone. As anyone whos read my blog will know, my new 360L Aquaoak aquarium is up and running but the volume of bogwood in there has caused the dreaded tea coloured water. It wasnt terrible by any means, but looking down the tank end to end it annoyed me as thats the end you were faced with as you enter the room. For filtration I have: First Fluval 406 with (in order of flow): Pre filter of Fluval Foam Fluval Bio Foam Fluval G-Nodes Fluval Biomax Fluval polishing pad Second Fluval 406 with (in order of flow): Pre filter of Fluval Foam Fluval Bio Foam Fluval G-Nodes Seachem Matrix Fluval polishing pad Fluval 106 (This powers my UV which needs lower flow) Pre filter of Fluval Foam Fluval G-Nodes Seachem Matrix Fluval polishing pad The water, whilst lovely and clear from head on: Looks like this from the end. I know its 5foot long so will never look quite like gin, but id like it better. So after some research I decided to take a punt on 2x 100gm pre-bagged packs of Seacem Purigen and put them both into one of the 406s packed as a sandwhich with fluval polishing pads. So I actually added the Purigen and an extra pad after it. 24hrs later. The curtains were drawn to keep ambient light the same during each end shot. I am astounded to be honest... The water looks amazing, and we are only 24hrs in! Something that actually works as well as it says on the tin! Ive got another 2 packets on order for the other 406!