Aquatic Experts 4 inch Ring Filter Socks 200 Micron - Premium Saltwater Aquarium Filter Socks for Sump, Reef & Marine Tanks - Durable Felt Filter Media (24 Pack, 4" x 14") - Perfect for Protein Skimmers, Sump Filtration & Water Clarification

Our filter socks are constructed only when our factory receives our exact specifications. Pre-molded with internal plastic handles for easy servicing, micron socks are truly the best upgrade to your filter/sump for polishing water. *Will NOT fit Red Sea or Waterbox holders. Superior construction and heavy-duty double stitched for maximum durability make these socks strong and durable so they can be cleaned and reused numerous times. You will receive our professional cleaning instruction included with your filter socks to safely clean your socks. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Strict quality control ensures our filter socks remain aquarium-safe all the way from our USA manufacturer to you. You can now buy with trust knowing that your filter socks will not come into contact with any harmful contaminants and will always arrive to your door safe for your aquatic friends. Compare Other Filtration Socks from Aquatic Experts 4" or 7" Ring 200 Micron Add to Cart 4" or 7" Ring 100 Micron Add to Cart Welded Seam Buying Options Drawstring Add to Cart Activated Carbon Add to Cart Customer Reviews 4.6 out of 5 stars 2,433 4.6 out of 5 stars 759 4.0 out of 5 stars 17 4.5 out of 5 stars 421 4.6 out of 5 stars 1,408 Material Type Felt Felt Felt Felt Charcoal Micron Rating 100/200 100/200 200 200 N/A Top Closure Plastic Ring Plastic Ring Plastic Ring Drawstring Tie N/A Stitching Type Double Stitched Double Stitched Ultrasonic Heat Sealed Double Stitched N/A Made in USA ✔ ✔ ✔ ✔ ✔ Is the 100 or 200 micron better for my aquarium? The lower the micron rating, the more floating debris it removes, hence the filter socks clog up faster. Many hobbyists have both which allots them to swap out their 200 micron socks from time to time. How often should I changes the filter socks? It depends on tank load, but generally you want to change your filter socks once a week or every two weeks. The more often you change, the better your water quality; it removes organic solids before they break down in aquarium. Is it better to use a longer sock or a shorter sock? Ideally the filter sock should be hanging in the water without touching or laying on the bottom of the sump. If a shorter sock is above the water line, there may be more noise as water drains from the sock side and splashes. What is the glaze finish on the sock? The socks are untreated and are designed with a 100% aquatic safe outside glaze. We do recommend giving them a quick rinse to prevent foam build up. Will these socks work with a reefer? No, We have personally tested our filter socks in the reefer sliding shelf sock holder. Our material is thick and our plastic ring is slightly too large to drop through the hole in the shelf.