Betta Undergravel Filters work by drawing water from the aquarium through the gravel this acts as a layer of filter media giving a huge surface area for filtration. - Suitable for Tropical Coldwater and Marine Aquariums. - Supplied with Uplift tube. Dimensions:

18" = 11" x 17"

24" = 11" x 23"

30" = 11" x 29"

36" = 11" x 35"

48" = 11" x 47"

Please also note, due to the size of this product it cannot be sent using Royal Mail and will be sent to you by a courier.

From this unfortunately the postage charge is slightly higher to cover the extra costs in packaging and freight costs that have to be incurred.

We are very sorry about this but we think the product is worth it.

Thank You