IceCap String Net Media Bag 4inx12in
SKU: IC-SNB4
- High-Volume Water Flow Design: Structural net mesh weave allows maximum water turnover, preventing water bypass and media dead zones.
- Heavy-Duty Drawstring Closure: Outfitted with a robust, reef-safe string pull that ties down tightly to keep loose media granules from escaping into pump impellers.
- 100% Metal-Free Material: Constructed entirely from high-grade, chemically inert polymers that will not decompose, fray, or leach pollutants into saltwater.
- Elongated 4in x 12in Profile: High-capacity slender footprint slips easily into deep sump baffles, overflow chambers, or high-volume canister media baskets.
- Rinse and Reuse Durability: Tough fiber walls rinse out quickly under fresh water, allowing you to reload fresh bulk media over and over again.
- Versatile Media Compatibility: Perfectly sized for containing coarse activated carbons, large granular ferric oxide (GFO), zeolite, and biological ceramic rings.
Dennerle
German-engineered freshwater excellence since 1966 — premium nano tanks, planted systems, shrimp care, and CO2 solutions.
IceCap String Net Media Bag — 4" x 12" (SKU: IC-SNMB-412)
The IceCap String Net Media Bag (SKU: IC-SNMB-412) is an authentic, durable chemical filtration housing accessory distributed by CoralVue to streamline media management inside marine reef sumps, freshwater canister filters, and large-scale multi-tank systems. Running bulk chemical media is one of the most effective ways to polish water and remove yellowing compounds, but finding the right containment vessel can be a challenge. Fine-mesh fabrics often trap detritus, clog quickly, and choke out vital water flow, creating stagnant water pathways. The IceCap 4in x 12in Net Bag features an open, structural grid weave that maximizes water turnover while ensuring your loose media stays securely contained exactly where you put it.
The primary structural benefit of the IC-SNMB-412 rests on its Reef-Safe Drawstring Closure Framework. Built completely without toxic metal zippers or metal eyelets that oxidize and leach heavy copper or rust into closed systems, this non-corrosive bag utilizes a durable pull-string lock. This allows you to load loose bulk carbon or biological media quickly, tie it down, and drop it straight into high-velocity flow lanes. Measuring an elongated 4 inches by 12 inches, this high-capacity media pouch can be washed out and reused through dozens of fresh filtration cycles, making it a reliable, cost-effective staple for large-scale aquarium maintenance.
Key Features
Prevents Sudden Water Channeling: The open string net pattern forces water to sweep through the entire media core rather than just pushing around the outside.
Protects Expensive Pump Impellers: Keeps granular fragments tightly locked away, preventing loose rocks or carbon chunks from lodging in active pump motors.
Streamlines Media Rinsing: The open netting allows you to flush away production fines and shipping dust under your RO/DI line quickly before placing the bag in your tank.
(Note: This retail package includes (1) empty 4" x 12" String Net Media Bag with an integrated drawstring closure. Bulk activated carbon, GFO, and bio-ceramics are sold under separate product categories).
IceCap String Net Media Bag Sizing Continuity
| Bag Dimensions | Factory SKU Identifier | Target Media Capacity | Recommended Filtration Placement |
|---|---|---|---|
| IceCap Net Bag — 3" x 8" | IC-SNMB-38 | Up to 1.5 Liters | Nano Sumps, AIO Chambers, HOB Filters |
| IceCap Net Bag — 4" x 12" | IC-SNMB-412 | Up to 4.0 Liters | Standard/Large Reef Sumps & Canister Filter Trays |
What’s Included:
(1) IceCap String Net Media Bag (4in x 12in) with Integrated Drawstring Pull
Technical Specs:
Official Manufacturing Title: IceCap String Net Media Bag 4inx12in
SKU / Factory Part Identifier: IC-SNMB-412
Physical Pouch Dimensions: 4.0" x 12.0" (4.0in×12.0in)
Mesh Configuration Profile: Coarse Open String Netting (For medium-to-large granular media sizes)
Closure Infrastructure: Integrated Reef-Safe Tie-Down Drawstring
Material Composition: 100% Non-Toxic, Inert Aquatic Polymer Blend
Chemical Treatment Resistance: Safe for use with active copper treatments, medications, and ozone
- Unbox your IceCap String Net Media Bag and give it a quick rinse under fresh tap water to clear away any packing dust from transit.
- Measure your required dosage of bulk chemical filtration media (such as pelletized activated carbon, coarse GFO, or ceramic rings). Note: This bag features an open net style weave. Ensure your media particle sizing is larger than the mesh openings to prevent fine granules from slipping through the net lines.
- Pour the dry bulk media carefully down through the open mouth of the 4" x 12" bag. Do not overstuff the bag; leave roughly 20% empty space inside so the media can shift slightly for maximum water contact.
- Pull the integrated string drawstring tight until the mouth of the net bag closes completely shut. Wrap the remaining string around the neck of the pouch and tie a secure double knot.
- Place the loaded bag under your RO/DI water line to rinse out any black carbon dust or mineral fines over a sink before adding it to your tank.
- Drop the rinsed media bag into a high-flow section of your filtration system, such as a sump baffle lane, right beneath your filter sock drains, or inside a canister filter tray. Replace or reload the media every 2 to 4 weeks depending on your bioload.
Pro Tips:
- Leave Some Slop Space Inside the Pouch to Maximize Surface Contact. When pouring your bulk carbon or bio-media into the IC-SNMB-412, resist the urge to pack it completely dense and solid to the top rim. If the netting is stretched completely rigid, the inner particles will be shielded from water flow, causing water to bypass the core. Leaving a little wiggle room allows the granules to tumble and spread out flat under active water currents, ensuring every single particle can adsorb toxins.
- Knead the Bag Weekly Under Water to Dislodge Trapped Organic Slime. Even inside clean, well-baffled filtration sumps, floating organic matter and bacterial biofilms will slowly settle over your media bag over time. This layer can form a skin that blocks water contact. During your weekly water checks, simply reach into your sump and give the net bag a few quick squeezes and flips underwater. This loose action knocks away trapped detritus and flips the inner media around, restoring peak flow.
- Pair with Coarse Carbon Pellets (like ROX 0.8) for the Cleanest Polishing Performance. Because this bag features a highly durable, open string net weave designed for maximum water turnover, it is the ultimate match for extruded cylindrical pellet carbons or large ceramic biomedia rings. Avoid using this net bag for powder-fine chemical powders or micro-fine iron resins, which can slip out into your water column. Using it for larger pellet media keeps your water crystal clear without restricting your flow.