I use one of those standard cartridge filters, and replace them monthly and run a couple bags of carbon. Pretty standard, right? But I am still getting crazy amounts of particular haze. The flow isn't too crazy, and I don't disturb the sandbed too often, so I'm assuming the filters are faulty. And this is where I need your help. Standard filter floss prices (though still cheap) seem to be inflated, so could I just use a couple sheets of felt? I've heard some use felt to make filter socks, and it looks texturally fine, so could I go this route, or just cough up the cash?