Is a 7 inch filter sock better than a 4 inch?

Not by default. A 7 inch sock has about three times the opening area of a 4 inch sock, so it handles more flow and debris, but it only works if your holder is built for it. For a 4 inch holder, a 4 inch sock is the better choice.

Can I use a 7 inch filter sock in a 4 inch holder?

No. A 7 inch ring is about 178 mm across and a 4 inch holder is about 102 mm, so it will not seat properly. If your holder is an unusual size, a made-to-order sock quoted to your measurements is the safer route than forcing a standard one.

What micron filter sock should I buy?

Choose the rating that matches the particles you want to remove, remembering that finer ratings clog sooner. The shop stocks 50, 100, 150, 200, 400 and 800 micron, and finer or in-between ratings such as 1, 5, 10, 25, 75, 300 and 600 micron are made to order.

Should I buy felt or nylon mesh?

Buy felt if you want depth filtration and are happy to treat the sock as a consumable. Buy nylon mesh if you want an exact opening and a sock you can rinse and reuse. Nylon mesh is not suitable for acids, and polyester felt is not for strong alkalis.

Do you make custom filter sock sizes?

Yes. Custom sizes, and size 1 to 4 bags for filter housings, are made to order and quoted within one working day. Send your holder dimensions, the micron rating and the liquid you are filtering through the contact page.

Where can I buy 4 inch and 7 inch filter socks in the UK?

Both standard sizes are sold online at filtersock.co.uk and dispatched from Leeds. Quantity breaks apply, and business customers can use trade accounts, purchase orders and VAT invoices.

Filter socks and bags, dispatched from Leeds

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Aqua Filter Socks

4 Inch vs 7 Inch Filter Sock: Which Size Do You Need?
A 4 inch filter sock suits most aquarium sumps and compact trade filter holders, while a 7 inch sock suits larger holders where you need roughly three times…