Start by identifying your filtration system and sump size. This listing offers a 100150200 micron pre‑filter sock bag at 150um, suitable for catching fine debris without overly restricting flow. Consider whether you need one sock or multiple for rotation, and ensure the bag size and inlet compatibility match your sump inlet. A higher micron rating captures larger particles; a lower rating traps finer debris but may reduce flow if overused.

Micron rating determines the size of particles filtered from the water. A 150 micron sock captures medium to fine debris while maintaining good water flow, helping keep your tank clean without clogging your filtration. If you keep delicate invertebrates or require clearer water, you might opt for a finer rating; for heavy sediment, a coarser rating may be easier to maintain with less frequent changes.

Clean socks when you notice reduced flow or visible buildup, typically every 1–2 weeks in a busy tank. Rinse with tank water to preserve beneficial bacteria, then air‑dry completely before reuse. Replace socks when they show wear, tears, or persistent clogging that reduces filtration efficiency. Keeping a small spare set ensures continuous filtration during maintenance.

Slide the pre‑filter sock over the appropriate inlet with the opening facing outward to catch debris before it enters the main filter. Ensure a snug fit to prevent bypass and secure any clamps or lids as required by your sump model. Periodically check the sock for knots or stretches that could cause water to bypass the filter.

Yes—pre‑filter socks like these are versatile for both freshwater and marine systems, helping to trap debris and protect pumps. If you maintain a reef or fish‑only tank, choose a micron rating that best suits your filtration needs and water quality goals. Always ensure compatibility with your sump’s size and the flow characteristics of your setup.

Measure your sump inlet diameter and the space available for replacement socks. Compare these measurements with sock dimensions and the pump inlet size listed in product descriptions. When in doubt, consult your tank’s manual or the retailer’s guidance to confirm that a chosen sock will fit securely and function with your filtration system without restricting flow.