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    …For the value, and reliability it is hard to beat. Max Head Height: 7.2 ft   The Tunze Osmolator 3155 is one of the safest ATO’s available. It utilizes an electronic eye sensor to monitor water levels and a backup float switch sensor with an optional audible alarm. The…

    $199.99 Regular Price: $

    …plug-and-play * No programming or adjustments required * Works in complete darkness   Specifications: ATO DC Pump Max Head - 8.2 ft ATO DC Pump Flow Rate - 74 gph Controller Dimensions - 2.2" H x .88" W x 1.9" L Sensor Cable Length - 10 feet Pump…

    $119.99 Regular Price: $

    The Tunze Osmolator Nano 3152 Auto Top Off is designed for smaller tanks, approximately 50 gallons and under. One of the safest ATO’s available. Utilizes a single sensor to monitor water levels and a controller that protects against overdosing. * Magnetic holder for sensors up to 10mm…

    $99.99 Regular Price: $

    Keep salinity and your aquariums water level consistent with Reef Breeders low profile Prism-ATO. Water level changes are registered in fractions of a second using infrared level sensors and with all internal components built into the sensor, there are no additional controllers to mount. Reef…

    $59.99 Regular Price: $

    …BRS recommend this? One of the most popular ATO systems available. The JBJ A.T.O system is by far the most cost-effective way of utilizing a safe and consistent auto top off system.  With multiple configurations, the JBJ A.T.O will fit almost anyone’s needs.  With…

    $84.99 Regular Price: $

    ATO containers have a removable lid to prevent excess evaporation while providing a large opening to refill and clean the reservoir as needed. Each ATO reservoir has two 0.25” OD holes for tubing or wires for float switches. The Sapphire, Trigger, Ruby, and Emerald line of ATO

    $134.99 Regular Price: $

    …system. The Exo Mounts easily to clear sump and aquarium walls with internal magnets that securely hold up to 1/4\" thick. The Reef Breeders Exo ATO system is an ultra-intelligent and compact bundle at an affordable price sure to make your tank more enjoyable.   Intelligent…

    $89.99 Regular Price: $

    Recommended for water applications like level controllers, auto top systems or other aquarium uses * Normally closed or normally open (see more) * 14” leads (22 gauge wire) * M16 straight threading - includes nut and silicon o-ring * 5/8" Mounting hole required …

    $15.99 Regular Price: $

    …help keep dust and debris out. The Trigger Systems ATO containers have a removable lid to prevent excess evaporation, while providing a large opening to refill the reservoir as needed. Each ATO reservoir has two 0.25” OD holes for ato plumbing or wires for float switches.   …

    $156.99 Regular Price: $

    …Xp Aqua's Sumpless ATO - Complete ATO & Surface Skimmer for Sumpless Aquariums    Sumpless ATO is the first and only ATO designed specifically for aquariums without sumps. The combination of the sleek overflow box and the innovative dual-optical sensor ATO will help to keep…

    $149.99 Regular Price: $

    The Tunze Switched Socket Outlet connects any brand of pump to the Osmolator Universal 3155 Auto-Top off system. The enclosed low-voltage centrifugal pump can be replaced by this switched socket outlet in combination with a more powerful pump.   The switched socket outlet can be used…

    $69.99 Regular Price: $

    Have you ever bumped a dosing or top off tube just to find a puddle of water on the floor a day or so later? The Smart ATO universal tube holder can solve that issue by securely mounting your top off or dosing tubing edge of your rimless or rimmed aquarium. Clamps to tanks with rims measuring…

    $12.99 Regular Price: $

    …help keep dust and debris out. The Trigger Systems ATO containers have a removable lid to prevent excess evaporation, while providing a large opening to refill the reservoir as needed. Each ATO reservoir has two 0.25” OD holes for ato plumbing or wires for float switches.   …

    $108.99 Regular Price: $

    …infrared light, will signal your Apex when it changes state from being wet to dry or dry to wet. This sensor can be used for constructing your own ATO (auto-top-off), as a high-level warning sensor in your sump, water storage level sensor, and much more. The sensors can be mounted on any type of…

    $34.95 Regular Price: $

    Xp Aqua's Ultimate ATO - The most complete ATO on the market    With 2x dual-optical sensors, the Ultimate ATO is the first ATO to include 4 sensors. The 4 sensors allow a dual-stage overfill alarm that is less intrusive as well as a run-dry protection feature that prevents your…

    $199.99 Regular Price: $

    …to drill or permanently mount to a reservoir. The Flood Guardian uses a dual optical sensor that can be magnetically attached to 5-gallon buckets, ATO containers, or even large saltwater mixing reservoirs, but then moved to any other container within seconds without leaving any holes behind. When…

    $69.99 Regular Price: $

    Ideal for auto top off applications. Our peristaltic pump has a slow, predictable 50 mL per minute flow rate which ensures gradual and subtle changes to water chemistry. Precision two roller design extends pump life and will not back siphon. 24-month warranty offered by Bulk Reef Supply. …

    $79.99 Regular Price: $

    …to refill is now here. Just slide out the easy to access acrylic drawer and fill it with up to 5 gallons of fresh water. Just put your favorite ATO pump in the reservoir through the pre-cut out opening in the back and you are ready to top off. Dimension - 18.2" L x 12.2" W x 23" H *…

    $199.99 Regular Price: $

    Fiji Cube sumps are characterized by truly unique design features and a clean, elegant design. When it comes to sumps, it they all operate on pretty similar designs and layouts, so choice can really come down to the fine details. Fiji Cube has incorporated some innovative and interesting features…

    $259.99 Regular Price: $

    …longer intervals required between maintenance and longer-lasting equipment.  A Slow Flow ATO System - In most cases, a simple low-flow pump and a timer will be a great solution to an ATO system but there are a few others on the market that use optical eyes and float valves that work great.…

    $329.99 Regular Price: $

    …infrared light, will signal your Apex when it changes state from being wet to dry or dry to wet. This sensor can be used for constructing your own ATO (auto-top-off), as a high-level warning sensor in your sump, water storage level sensor, and much more. The sensors can be mounted into custom…

    $24.95 Regular Price: $

    …fittings are an awesome addition to any aquarium. You can now have the ability with the simply push of a finger to disconnect your carbon reactor, ATO pump, return pump or any other piece of plumbing in or around your aquarium. Their patented, ergonomic, easy to use design uses grey polypropylene…

    $9.99 Regular Price: $

    …automatic top-off (ATO) device the first piece of automation equipment purchased. The ironic flip side of this decision is that a faulty ATO device is one of the leading reasons for catastrophic aquarium failure, or even worse, flooding of the house or business. Not all ATO devices are…

    $199.95 Regular Price: $

    …solenoid to replace the pump they are equipped with out of the box. If you have upgraded to a larger system, or just simply don't have the room for an ATO storage container this may be the option for you. Replacing the stock pump with the Smart Solenoid will easily take under 1 minute. Simply…

    $22.99 Regular Price: $

    ATO systems pump or intake line is place 1/2" to 1" above the base of your reservoir, ensuring only the clear slurry is being dosed.  Step 5. Activate your ATO and monitor the pH of your aquarium as the kalkwasser solution is being dosed, not exceeding increases of 0.20 pH. Your ATO

    $17.49 Regular Price: $

    …connect up to six external switch inputs. The breakout box is compatible with any Apex Controller. * Float Switches for sump alerts or ATO (Auto Top Off) * Push Buttons for special feed, cleaning, ect. modes * Leak Detectors * Magnetic switches on cabinets for intrusion…

    $39.95 Regular Price: $
    Out of Stock

    …precise, robust, and versatile.   The Versa excels in many precision aquarium pump applications, including; dosing, auto top off (ATO), automated water changes, and reactor feeding. * Precision DC Stepper Motor with planetary gearing mechanism * Intelligent control w/BLE…

    $149.99 Regular Price: $
    Out of Stock

    …Off * Carbon Reactors * GFO Reactors * BioPellet Reactors * Ideal for Salt or Freshwater   Auto-Top-Off (ATO) ATO will likely be the most popular use for this pump. And unlike many wimpy pumps out there, the PMUP has enough pressure to push water up 14 feet…

    $49.95 Regular Price: $
    Out of Stock

    Sapphire ATO reservoirs feature crystal clear acrylic with an elegant emerald top, to hold top off water for your aquarium in a closed container. The Trigger Systems ATO containers have a removable lid to prevent excess evaporation, while providing a large opening to refill and clean the reservoir…

    $182.99 Regular Price: $
    Out of Stock

    Fiji Cube sumps are characterized by truly unique design features and a clean, elegant design. When it comes to sumps, it they all operate on pretty similar designs and layouts, so choice can really come down to the fine details. Fiji Cube has incorporated some innovative and interesting features…

    $339.99 Regular Price: $
    Out of Stock

    …to refill is now here. Just slide out the easy to access acrylic drawer and fill it with up to 5 gallons of fresh water. Just put your favorite ATO pump in the reservoir through the included 4" x 1" opening in the back and you are ready to top off. Dimension - 8.1" L x 11.5" W x 20.3"…

    $129.99 Regular Price: $

    The Standard Generic Float Switch is great for: * General water level control applications * Aquarium top-off applications * Humidification/de-humidification applications * Hydroponics projects * Water features * Air conditioning drain pan applications …

    $10.99 Regular Price: $