I have a Red Sea Reefer 170 and like most people I've become tired of cleaning filter socks. As a result, I spent some time searching then internet for inspiration and came up with an alternative that works pretty well using a filter pad. So, here is what I came up with and the steps I used to make it: 1. I cut the sock portion off a filter sock so I ended up with the plastic ring. 2. I searched the Dollar Tree store, Walmart, and any other store I could think of that might have a plastic container to fit the plastic ring. I finally found a liter bottle at a store call Tap Plastic. 3. I cut the top portion of the bottle off and placed the ring around the top of the bottle. I used silicone to glue the two pieces of plastic together (inside top and outside). 4. I then marked a series of holes approx. 1/2" up from the bottom of the bottle, all around the bottle. I used a 1/4" drill bit and drilled the holes in approx. 1" segments around the circumference. You may need more or less holes, or bigger, depending on your flow. I got lucky and my initial pattern worked great without raising or lowering my sump water height. 5. Once the silicone is dry and the holes are drilled, then I cut a piece of filter pad to fit inside the bottle. You can fill it as full as you'd like. I chose to use a single layer on the outside edge so the water can flow down into the bottle, then though the floss and out the holes. 6. You could make two and simple pull one out and insert another with a clean filter pad or just pull the dirty pad out and replace with clean pad. Easy Peezy, Lemon Squezzy, no filter sock to clean. So far its been three days and everything it working great. I figure if I can get a week out of a filter pad it will be worth it.