{"product_id":"marina-airstone-2-5cm-card","title":"Marina AirStone 2.5cm card","description":"\u003cp\u003e\u003cstrong\u003eA small diffuser that turns pump air into fine bubbles instead of a noisy stream.\u003c\/strong\u003e The Marina Air Stone 2.5 cm is a single carded air stone that pushes onto standard aquarium airline and breaks the air from your pump into a fine column of bubbles. Most of the useful oxygen exchange happens where those bubbles disturb the water surface, not inside the bubbles themselves — which is why a fine, steady column beats a few big blobs. Suits freshwater and marine tanks.\u003c\/p\u003e\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFine-bubble diffusion\u003c\/strong\u003e — a finer bubble column drives more surface movement per litre of air than a bare airline end.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5 cm size\u003c\/strong\u003e — small enough to hide behind a rock or plant, or to drop into a quarantine tub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePush-fit to standard airline\u003c\/strong\u003e — no adaptor, no clamp, no tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFreshwater and marine\u003c\/strong\u003e — the same stone works in either, though salt shortens its service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eMarina\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eType\u003c\/th\u003e\n\u003ctd\u003eAir stone (air diffuser)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSize\u003c\/th\u003e\n\u003ctd\u003e2.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eConnection\u003c\/th\u003e\n\u003ctd\u003eStandard aquarium airline, push fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWater type\u003c\/th\u003e\n\u003ctd\u003eFreshwater and marine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePack\u003c\/th\u003e\n\u003ctd\u003eSingle air stone, carded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSKU\u003c\/th\u003e\n\u003ctd\u003eAA2364\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eMarina does not currently publish a material composition, a recommended pump output range or a service life for this stone, so none is stated here.\u003c\/p\u003e\n\u003ch3\u003eWhat's included, and what you'll also need\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIncluded\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOne 2.5 cm air stone on a card\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAn air pump — the stone does nothing on its own. For power cuts and transport, see the \u003ca href=\"\/products\/marina-battery-operated-air-pump\"\u003eMarina Battery Operated Air Pump\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eAirline tubing\u003c\/li\u003e\n\u003cli\u003eA check valve, which stops water siphoning back into the pump if the pump sits below the water line\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAdding surface movement and gas exchange to a community or marine tank\u003c\/li\u003e\n\u003cli\u003eAerating a quarantine tub, hospital tank or fry container\u003c\/li\u003e\n\u003cli\u003eDriving a sponge filter or an under-gravel uplift\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDiffusing CO2 — air stones are far too coarse for that, and running CO2 alongside heavy aeration works against you\u003c\/li\u003e\n\u003cli\u003eTanks holding fish that dislike current and surface turbulence, such as bettas, unless the pump output is turned right down\u003c\/li\u003e\n\u003cli\u003eUse without a check valve where the pump sits below the water line\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\n\u003cp\u003eAir stones are consumables. Over weeks to months the pores fill with mineral scale and biofilm, the bubbles coarsen and the pump has to work harder against the back pressure.\u003c\/p\u003e\n\u003cp\u003eSoak a clogged stone in fresh water and scrub it lightly, or replace it. Do not use soap or detergent. Replace the stone once cleaning no longer restores a fine, even bubble column.\u003c\/p\u003e\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/marina-battery-operated-air-pump\"\u003eMarina Battery Operated Air Pump\u003c\/a\u003e — the air source for transport tubs and blackouts\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/marina-fish-net-breeder-box\"\u003eMarina Fish Net Breeder Box\u003c\/a\u003e — pairs with a stone to keep water moving around fry\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/marina-black-fish-net\"\u003eMarina Black Fish Net\u003c\/a\u003e — for moving fish into the aerated container\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/marina-floating-glass-thermometer\"\u003eMarina Floating Glass Thermometer\u003c\/a\u003e — aeration cools a small container faster than people expect\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eAir stones are a consumable item and carry no published manufacturer warranty term. Your rights under the Australian Consumer Law apply in addition to anything the manufacturer offers, and are not limited by this page.\u003c\/p\u003e\n\u003cp\u003eShips as a standard parcel item. No dangerous goods or oversize handling applies.\u003c\/p\u003e\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eDo bubbles actually add oxygen to the water?\u003c\/h4\u003e\n\u003cp\u003eMostly indirectly. Very little oxygen transfers from inside a rising bubble. The gain comes from the bubbles breaking the surface and constantly renewing the water in contact with air, which is why a stone placed low in the tank does more than one sitting near the top.\u003c\/p\u003e\n\u003ch4\u003eHow often should an air stone be replaced?\u003c\/h4\u003e\n\u003cp\u003eWhen the bubble column coarsens or the pump starts labouring. There is no fixed interval, and hard water and marine tanks clog a stone faster than soft fresh water.\u003c\/p\u003e\n\u003ch4\u003eDo I need a check valve?\u003c\/h4\u003e\n\u003cp\u003eIf the air pump sits below the water level of the tank, yes. Without one, a power cut can siphon tank water back down the airline and into the pump.\u003c\/p\u003e\n\u003ch4\u003eWill one 2.5 cm stone be enough for my tank?\u003c\/h4\u003e\n\u003cp\u003eFor a small tank or a quarantine tub, usually. Aeration is set by the pump's output and the number of outlets rather than by stone size, so on a larger tank people generally run two stones or a longer bubble bar.\u003c\/p\u003e","brand":"Marina","offers":[{"title":"Default Title","offer_id":55242284368163,"sku":"AA2364","price":2.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/marina-airstone-25cm-card-3001242-1600.jpg?v=1781836766","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/marina-airstone-2-5cm-card","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}