If you're looking for crystal clear water, the Red Sea 225 Micron Thin Mesh bag is a great addition to your sump filtration system, trapping ultra fine debris from your fish tank.

Here's what Red Sea say about their range of Post Filter Bags:

A range of 3 high quality, reusable aquarium filter bags providing different levels of mechanical filtration. These 10.5″/26cm long filter bags for Red Sea’s REEFER and MAX-S aquariums will also fit any standard 4″/10cm filter bag holder.

Red Sea’s 100 & 225 micron aquarium Felt filter bags

Available in 2 porosities, the felt filter bags are very effective at trapping particulate matter in the thick wall of the bag.

Red Sea 100 micron Aquarium felt filter bags

100 micron felt filter bags are designed to provide fine ‘polishing’ of water that is already low in particulate matter (mature aquariums).

Red Sea 225 micron Aquarium felt filter bags

225 micron felt filter bags are ideal for regular day to day use and enable a longer period between cleaning than with the 100 micron bags.

Red Sea’s 225 micron Thin-Mesh aquarium filter bags

225 micron thin-mesh aquarium filter bags are perfect for new setups and after heavy maintenance or whenever there is a lot of particulate matter in the water. They are also suitable as a holder for other mechanical or chemical filter media. The monofilament construction of these bags makes them very easy to clean. These bags are now used in REEFER™ and MAX-S™ Systems.

One thing is for sure, Red Sea do know what they're doing when it comes to marine fish keeping, which is why we stock the full range on our shelves - including the Reefers all boxed and ready to go - so if you're looking for a Filter Sock for your sump filtration system - you've probably just found what you're looking for.

Aquacadabra acts as credit broker/intermediary and not as a lender.

Klarna's credit products are provided by Klarna Bank AB, which is authorised and regulated by the Swedish Financial Services Authority, with limited supervision by the Financial Conduct Authority. More information can be found here.

Newpay finance options are provided through Deko’s platform by NewDay. P.D. Aquatics Ltd, t/a Aquacadabra is an Introducer Appointed Representative of Pay4Later Ltd, t/a Deko, which is authorised and regulated by the Financial Conduct Authority (ref no 728646) and is a credit broker, not a lender. NewDay Ltd is authorised and regulated by the Financial Conduct Authority (ref no 690292) and is authorised by the Financial Conduct Authority under the Payment Services Regulations 2017 for the provision of payment services (ref no 555318). More information can be found by clicking the newpay option above, or in the Newpay FAQs.

We really want you to be happy with the product that you've received. If however, when the goods arrive they're not what you want, then no problem - we have a 60 day no quibble return guarantee. Just let us know that you're going to return the item(s) by contacting us(stating your Order Number) and complete the returns packing slip that will have been included with your delivery. This will help us to quickly identify the item that you have returned (unopened and unused) - and we'll put a refund through for you.