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https://www.swelluk.com:443/swell-mesh-filter-bag/ 
Swell Mesh Filter Bag
Ideal for filter media, and flexible enough to suit most filters and sumps, these filter bags can be used for a variety of material to ensure optimum filtration in your tank.
Products
Product Information
These Filter Media Bags come in a choice of grades, so you can use a selection of media within them. The coarse grade bag, is ideal for use with biological filtration, such as bioballs, either plastic or ceramic, and other larger items, like charcoal, or Alfagrog.
The finer grade bag is better suited to smaller media, such as carbon or zeolite. Both bags come with drawstrings so your media doesn't fall out and they can be partly filled and used in smaller spaces, like filter compartments, or filled right up for sump use.
These bags come in a range of sizes:-
Large bags - 45x60cm
Small bags - 30x45cm
Available in both 2mm and 4mm grades.
Latest Customer Reviews
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Rating Date 30/04/2021 06:04am Swell Mesh Filter Media Bag 45x60cm - 4mm
Bought to use with alpha grog after previously using the green bags which tore. I was hoping they would be stronger but they will also tear with alpha grog. Should be adequate for use with plastic media or K1. -
Rating Date 15/02/2021 16:02pm Swell Mesh Filter Media Bag 45x60cm - 4mm
Great product, robust and well made. -
Rating Date 08/10/2020 08:10am Swell Mesh Filter Media Bag 30x45cm - 4mm
Great value for money. A good buy