{"product_id":"as-aquaristik-airstone-vario-s-125mm","title":"Airstone Vario S (125 mm)","description":"\u003cdiv class=\"ai-seo-content\"\u003e\n\n\u003ch2\u003eAirstone Vario S 125 mm – Premium Fine-Bubble Air Stone for Aquarium Oxygenation\u003c\/h2\u003e\n\n\u003cp\u003eThe Airstone Vario S (125 mm) is a compact, high-performance cylindrical air stone designed to introduce a curtain of fine oxygen bubbles into freshwater and saltwater aquariums. At 125 mm in length, it is ideal for smaller tanks, nano aquariums, and targeted aeration zones within larger setups. The porous sintered material creates consistently small, uniform bubbles that rise slowly through the water column, maximizing oxygen transfer efficiency and promoting beneficial water circulation.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eAir stones work by distributing compressed air (from an air pump) through a porous diffusion medium — typically sintered mineral material — into the water in the form of small bubbles. As these bubbles rise to the surface, they agitate the water surface, promoting gas exchange: oxygen enters and carbon dioxide exits. Additionally, the rising bubbles create gentle water circulation throughout the aquarium, helping to distribute heat evenly and prevent stratification.\u003c\/p\u003e\n\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFine bubble output — maximum oxygen transfer surface area per liter of air\u003c\/li\u003e\n  \u003cli\u003e125 mm length — ideal for smaller tanks and targeted aeration\u003c\/li\u003e\n  \u003cli\u003eDurable sintered material — long service life with proper maintenance\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard 4 mm airline tubing\u003c\/li\u003e\n  \u003cli\u003eModular design — multiple units can be connected in series by removing the end cap\u003c\/li\u003e\n  \u003cli\u003ePromotes water circulation and prevents temperature stratification\u003c\/li\u003e\n  \u003cli\u003eSuitable for freshwater and marine (saltwater) aquariums\u003c\/li\u003e\n  \u003cli\u003eEnhances visual appeal with a decorative bubble curtain effect\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eLength: 125 mm\u003c\/li\u003e\n  \u003cli\u003eType: cylindrical sintered air stone\u003c\/li\u003e\n  \u003cli\u003eAirline connection: 4 mm (standard)\u003c\/li\u003e\n  \u003cli\u003eBubble size: fine\u003c\/li\u003e\n  \u003cli\u003eMaterial: sintered mineral (ceramic-type porous stone)\u003c\/li\u003e\n  \u003cli\u003eEnd cap removable for series connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAquarium Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePrimary aeration source for fish-only tanks\u003c\/li\u003e\n  \u003cli\u003eSupplementary aeration for planted tanks during the night period (when plants consume oxygen rather than producing it)\u003c\/li\u003e\n  \u003cli\u003eAeration in breeding tanks and nursery aquariums\u003c\/li\u003e\n  \u003cli\u003eHospital tanks requiring gentle, well-oxygenated water\u003c\/li\u003e\n  \u003cli\u003eShrimp tanks where gentle surface agitation is preferred\u003c\/li\u003e\n  \u003cli\u003ePond and water garden aeration\u003c\/li\u003e\n  \u003cli\u003eDecorative bubble wall effect in display aquariums\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAll standard aquarium air pumps\u003c\/li\u003e\n  \u003cli\u003eStandard 4 mm inner diameter airline tubing\u003c\/li\u003e\n  \u003cli\u003eFreshwater and marine aquariums\u003c\/li\u003e\n  \u003cli\u003eCan be connected in series with other Vario airstone units for extended bubble curtains\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eShould I use an airstone in a planted aquarium?\u003c\/strong\u003e During the light period, airstones can compete with CO2 injection by accelerating CO2 off-gassing. However, running an airstone at night (when lights are off and plants switch to consuming O2) is excellent practice to prevent fish from oxygen depletion in heavily planted tanks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I clean an airstone?\u003c\/strong\u003e Soak in a 3% hydrogen peroxide solution for 30 minutes, then rinse thoroughly with clean water. Regular cleaning restores bubble output and extends service life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I connect multiple units?\u003c\/strong\u003e Yes. Remove the black end cap from the stone to connect it in series with additional units.\u003c\/p\u003e\n\n\u003ch3\u003eExpert Recommendations\u003c\/h3\u003e\n\u003cp\u003eUse the Airstone Vario S with a quality air pump and an adjustable valve to control bubble rate. In planted tanks with CO2 injection, connect the airstone to a timer so it only runs during the night period, avoiding CO2 losses during the light period.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"AS Aquaristik","offers":[{"title":"Default Title","offer_id":61633293779274,"sku":"74p03275","price":2.3,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0771\/3685\/5370\/files\/14_377fc410-2734-4b2c-b19b-45ac7514443f.jpg?v=1780177123","url":"https:\/\/aquarium-boutique.com\/bg\/products\/as-aquaristik-airstone-vario-s-125mm","provider":"Aquarium Boutique","version":"1.0","type":"link"}