Instruct: Classify an Amazon review as either positive or negative.
Query: All Well and Good But...

The item is of sturdy construction and higher quality than expected. The only watch out I would give is that the plastic lock shaft turn piece thing on the bottom is easy to deform if you just try to push one side of it (like with a small screwdriver) so always open & close with a pair of needle nose pliers.That being said...HOW IN GOD'S NAME DO YOU PUT THE AMMONIA REMOVING MEDIA / CHARCOAL SUBSTRATE IN THIS GODFORSAKEN THING?Seriously though. The way the inner inlet tube projects relative to the rod that turns and locks it closed makes it impossible to keep one end open to put the substrate in without pushing the plastic mesh out of the guides that hold it in place? I am tempted just to cut a little 'door' in the plastic mesh and then just zip tie it closed after I fill it up.Surely I am doing something wrong. The Magnum 350 canister filter didn't have any instructions with it (bought used) so any help would be greatly appreciated.