Review on Fluval Levelling Device Replacement Filters by Darlene Thomas

This serves as a weird tilting mechanism for your filter which needs to tilt forward a little to get the water out of the filter instead of the flooding the entire floor with water or (if you're lucky) simply not letting the filter work. I'd spent two flooded floors and hours looking for the little thing wherever it rolls, usually a dark room covered in cobwebs with a 50-gallon aquarium you definitely can't step aside to find. . So you will lie on your stomach with a flashlight and try to find them. When I first assembled the AquaClear filter, I didn't see it in the instructions and had no idea what to do with it - read the instructions in multiple languages until I saw a reference to this fun little thing referred to as the outside is the bottom of your filter. Filter into an equally small hole that you won't lose too much at home - push it all the way in if your life depended on it, or maybe you'll get lucky and have an intense struggle. I've always said these are the best filters out there, but considering this small piece and its tendency to clog easily, I'm beginning to wonder. I have to adjust or clean all but my smallest filters several times a day. It's great that it catches all that dirt (and we change the water weekly), but it sucks that it soaks up pain - and that part is one reason (there are a few others).