{"product_id":"xpaqua-duetto2-ato","title":"XP Aqua Duetto2 ATO","description":"\u003cp\u003e\u003cstrong\u003eHands-off, rock-steady water level.\u003c\/strong\u003e The XP Aqua Duetto 2 is the world's smallest dual-sensor auto top-off, a complete plug-and-play system that automatically replaces evaporated water to keep your water level and salinity stable. Its proprietary dual-optical sensor packs a primary and a backup sensor into one tiny housing, working with intelligent QST programming to prevent overfilling. Everything you need is included, and a magnetic coupling makes mounting the sensor take seconds. For AIO and nano tanks without a sump, see the \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/xpaqua-sumpless-ato2\"\u003eSumpless ATO2\u003c\/a\u003e.\u003c\/p\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eWorld's smallest dual-optical sensor: a primary level sensor plus a secondary backup\u003c\/li\u003e\n\u003cli\u003eIntelligent QST programming with two layers of overfill protection\u003c\/li\u003e\n\u003cli\u003eComplete kit with a quiet 74 gph DC pump, tubing, and mounting hardware\u003c\/li\u003e\n\u003cli\u003eMagnetic coupling for tool-free sensor mounting on glass up to 1\/2 inch\u003c\/li\u003e\n\u003cli\u003ePlug-and-play, with no programming or calibration required\u003c\/li\u003e\n\u003cli\u003eWorks on both freshwater and saltwater aquariums\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eSpecifications\u003c\/h3\u003e\u003ctable style=\"border-collapse:collapse;margin:6px 0 4px;font-size:0.95em;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eXP Aqua (AutoAqua)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eDual-sensor auto top-off (ATO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eSensor\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eDual optical, primary plus backup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003ePump\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e74 gph (280 L\/h) DC, 8.2 ft head, 4.8 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eMagnetic, glass up to 1\/2 in (12.7 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003ePower\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003e100 to 240 VAC adapter, 6 ft cables\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eBest for\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eFreshwater and saltwater aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f5f5f5;font-weight:600;width:40%;\"\u003eMade in\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eTaiwan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eSetup\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMount the sensor at your target water level using the magnetic coupling\u003c\/li\u003e\n\u003cli\u003ePlace the pump in your RO\/DI top-off reservoir and run the tubing to the tank\u003c\/li\u003e\n\u003cli\u003ePlug it in; it tops off automatically when the level drops and stops at the set point\u003c\/li\u003e\n\u003cli\u003eUse RO\/DI or fresh top-off water only, never saltwater, since an ATO replaces evaporation and not salt\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003ePair It With\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/xpaqua-sumpless-ato2\"\u003eXP Aqua Sumpless ATO2\u003c\/a\u003e for AIO and nano tanks without a sump\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/autoaqua-smart-ato-nano-g2-optical-auto-top-off-system\"\u003eAutoAqua Smart ATO Nano G2\u003c\/a\u003e for a simpler single-sensor option\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/autoaqua-titanium-s2-inline-tds-meter-rodi-monitor\"\u003eAutoAqua Inline TDS Meter\u003c\/a\u003e to keep an eye on your RO\/DI water quality\u003c\/li\u003e\n\u003cli\u003eBrowse more \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/maintenance-water-care\"\u003ewater care\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"margin:16px 0 6px;font-size:1.05em;font-weight:600;line-height:1.25;border-left:4px solid #666;padding-left:8px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does an auto top-off do?\u003c\/strong\u003e\u003cbr\u003eIt automatically replaces water lost to evaporation, so your water level and salinity stay stable and you do not have to top off by hand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFreshwater or saltwater?\u003c\/strong\u003e\u003cbr\u003eBoth. Stable water level benefits any tank, and it is especially valuable on reef tanks where evaporation shifts salinity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I fill the reservoir with fresh or salt water?\u003c\/strong\u003e\u003cbr\u003eFresh RO\/DI water only. Evaporation leaves salt behind, so topping off with saltwater would steadily raise your salinity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if a sensor fails?\u003c\/strong\u003e\u003cbr\u003eThe dual-optical sensor and QST programming provide two layers of protection: the backup sensor shuts the pump off if the primary has an issue, preventing an overfill.\u003c\/p\u003e","brand":"AutoAqua","offers":[{"title":"Default Title","offer_id":48257212678363,"sku":"21240","price":167.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_a4499ad1-1f22-490d-8128-7001cdacb3dc.png?v=1770993123","url":"https:\/\/squeakysaquatics.com\/products\/xpaqua-duetto2-ato","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}