This product can be found in: Aquarium Filters: All | Aquarium Pumps | BiOrb Accessories | Fish Tank Accessories: All | Fish Tank Supplies   UK Standard Delivery FREE on orders over £39* Available For Express Despatch Standard Despatch Cost + £2.99 This item is deliverable to most EU Countries From £7.99   BiOrb Airstone 5839 0 reviews | Login to review £1.69 The air stone at the base of the aquarium breaks up the flow of air into a mass of bubbles. After a time this can be become blocked by calcification, especially in hard water areas, reducing the flow of air into the aquarium. Replacing the air stone every few months will keep your aquarium bubbling away nicely.

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