The Phosband is on the left and the carbon is on the right. Should the carbon be like that where it's split in half? I just can't seem to fix it since the water pushes the top half to the top.
when starting the reactor most of the media is still floating. start with less flow until the media has dropped to the bottom. once there you can increase the flow. this happens when the top media is packed together not allowing the water to flow through it as readily.
Also how old is the media? once packed with debris it tends to clump together. better to use less and change often.
Also the water should go into the carbon first. the GFO requires less GPH because more will only cause it to break up and leak out.
i'll try the less flow method next time i change them out. also, its running from sump -> gfo -> carbon back to sump. it's how it's stated on the reactor, reason being that the carbon will pick up any "fines" from the gfo.
China, that is a BRS thing and they are backwards. You are using your GFO to pre-filter the water and that is the GAC's job. Running the water through tht GFO frist will rapidly deplete and plug up the GFO surface area for doing what it is suppose to do, remove phosphate and silica. As can be see by your set up the GAC seems to have to much flow.