{"product_id":"red-sea-module-ato-reefcontrol","title":"Red Sea ReefControl ATO Module — Auto Top-Off for Lite and Pro Controllers","description":"\u003cp\u003eThe \u003cstrong\u003eRed Sea ReefControl ATO Module\u003c\/strong\u003e adds automatic top-off to your system — and it does not work alone: it requires a \u003ca href=\"\/en\/products\/red-sea-reefcontrol-lite\"\u003eReefControl Lite\u003c\/a\u003e or \u003ca href=\"\/en\/products\/red-sea-reefcontrol-pro\"\u003ePro\u003c\/a\u003e controller. Connected to the controller, it compensates evaporation continuously: the sensor watches the sump level, the pump brings RO water from the reservoir, and ReefBeat logs every millilitre — daily top-off volume becomes a tracked metric of your tank.\u003c\/p\u003e\n\n\u003cdiv style=\"margin:20px 0;\"\u003e\u003cvideo controls preload=\"metadata\" playsinline poster=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/preview_images\/1338385c9a05467fba4fb82e4d8d2725.thumbnail.0000000000.jpg?v=1786662047\" data-vs=\"rc-family-en\" style=\"width:100%;border-radius:8px;\"\u003e\u003csource src=\"https:\/\/cdn.shopify.com\/videos\/c\/vp\/1338385c9a05467fba4fb82e4d8d2725\/1338385c9a05467fba4fb82e4d8d2725.HD-1080p-2.5Mbps-91555257.mp4\" type=\"video\/mp4\"\u003e\u003c\/video\u003e\u003c\/div\u003e\n\n\u003ch2\u003eWhat the ATO module does for a reef tank\u003c\/h2\u003e\n\u003cp\u003eEvaporation pushes salinity up every day — and salinity stability is one of the keys to reef keeping. The ATO module locks it down: constant level, constant salinity, no daily watering can. In ReefBeat you see the volume added day after day; a consumption that suddenly changes is often the first sign of a problem — open lid, leak, weakening pump.\u003c\/p\u003e\n\u003cp style=\"text-align:center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/red-sea-ato-module-components-english.png?v=1786667503\" alt=\"Red Sea ReefControl ATO module system components — official diagram\" width=\"2560\" height=\"1695\" loading=\"lazy\" style=\"max-width:520px;width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation — know this before you buy\u003c\/h2\u003e\n\u003cp\u003eThe level sensor mounts directly in a Red Sea sump. Outside a Red Sea sump, Red Sea states a sensor holder is required (manufacturer parts R35629 or R35623, on request). The module connects to the controller's dedicated port — it does not use up a ReefSense probe port.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eDoes the ATO module work on its own?\u003c\/h3\u003e\n\u003cp\u003eNo. It requires a ReefControl Lite or Pro controller — the controller drives it and sends the alerts in ReefBeat.\u003c\/p\u003e\n\u003ch3\u003eDoes it take up a probe port?\u003c\/h3\u003e\n\u003cp\u003eNo — it connects to the controller's dedicated connection. Your ReefSense ports stay free for measuring probes.\u003c\/p\u003e\n\u003ch3\u003eDoes it work with another brand's sump?\u003c\/h3\u003e\n\u003cp\u003eYes, with the appropriate sensor holder: Red Sea offers holders R35629 and R35623 for non-Red-Sea sumps — write to us and we will order them.\u003c\/p\u003e\n\u003ch3\u003eHow is it different from the ReefATO+?\u003c\/h3\u003e\n\u003cp\u003eThe ReefATO+ is Red Sea's standalone top-off; the ReefControl ATO Module is the ecosystem version: same mission, but driven by your controller and logged in ReefBeat with the rest of the system.\u003c\/p\u003e\n\n\u003ch2\u003eWhy buy from ReefSolution\u003c\/h2\u003e\n\u003cp\u003eReefSolution is an authorized Red Sea dealer in Canada — no customs or exchange surprises. The module connects to the \u003ca href=\"\/en\/products\/red-sea-reefcontrol-lite\"\u003eReefControl Lite\u003c\/a\u003e or \u003ca href=\"\/en\/products\/red-sea-reefcontrol-pro\"\u003ePro\u003c\/a\u003e. Shipping across Canada and expert advice in-store in Laval.\u003c\/p\u003e","brand":"Red Sea","offers":[{"title":"Default Title","offer_id":47620876796075,"sku":"RSR35823","price":216.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/ATO-module.jpg?v=1786667542","url":"https:\/\/reefsolution.com\/en\/products\/red-sea-module-ato-reefcontrol","provider":"Reef Solution","version":"1.0","type":"link"}