Seachem Filter Sock 250 micron mesh 10 x 30 cm / 4 Inch x 12 Inch

Filter socks are a critical component in maintaining water quality in aquariums. They remove suspended debris and detritus, which often lead to excess dissolved organics, nitrate, and phosphate when left unchecked.

This makes Seachem Filter Socks an integral addition to any sump and overflow system. Seachem Filter Socks feature durable, welded seams and have a singed finish, which reduces wear and prevents release of fibers back into the water column.

In addition to a 250 micron rating for exceptional particulate removal, they feature welded seams, which, unlike threaded seams of similar products, will not breakdown over time. They have a singed finish, which reduces wear and prevents release of fibers back into the water column. Finally, the plastic collar simplifies installation and easily fits standard sump fittings.

Specifications

What it is. A mechanical pre-filter sock for a sump, built to strip suspended debris and detritus out of the water before it breaks down into dissolved nitrate and phosphate load.

Where this sits in the Seachem range. Seachem sells this sock in three micron ratings (250, 200 and 100) in two sizes, small (10 x 30 cm / 4″ x 12″) and large (17.5 x 40.5 cm / 7″ x 16″). This is the 250 micron rating in the small size, the coarsest of the three.

What the micron rating means. Seachem’s own explanation: a micron is one millionth of a metre, and the rating describes the mesh opening: the lower the number, the finer the weave and the smaller the particle it traps. At 250 micron this sock is built from a coarser mesh fabric, not the finer felt used on the 200 and 100 micron socks below.

Welded seams, singed finish. Seachem builds all three ratings with welded rather than sewn seams, since a threaded seam breaks down with repeated washing, and gives the fabric a singed finish so it doesn’t shed loose fibre back into the tank.

Setup & Use

Fits a standard sump overflow via the sock’s plastic collar, sized to match: 10 cm / 4″ for this small size.

Best run ahead of a finer sock, not on its own, if your sump has room for two stages: a coarse 250 micron sock catches large debris first, extending the working life of a finer 200 or 100 micron sock downstream.

Routine cleaning: rinse under a high-pressure hose once the sock visibly discolours, anywhere from every few days to weekly depending on bioload, per Seachem.

Deep cleaning: soak in a 1:10 bleach-to-water solution for 24 hours, then rinse thoroughly under a high-pressure hose before it goes back in the sump.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months’ remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Filter media and substrates carry no manufacturing or expiry date: their working life begins on first contact with water, not on the shelf.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number, or email us if you would rather, and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 48 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.