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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: $

    …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: $

    …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: $

    …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: $

    …The Micro ATO includes an optical water level sensor to keep an eye on the level within the sump with no moving parts. The optical sensor is very reliable, even in complete darkness, keeping a steady water and salinity level replacing any evaporated water with fresh water. The Micro ATO, like its…

    $134.99 Regular Price: $
    Out of Stock

    …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: $

    …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 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: $

    …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: $

    …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: $

    Connects directly to AutoAqua's Smart ATO and Smart ATO Micro! AutoAqua's Smart ATO DC Refill Pump only takes a few minutes to replace, and in all honesty, they are not the highest quality, but they are low in price, making it wallet-friendly to keep a back-up on hand in case your current one…

    $23.00 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 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: $

    Easily replace the low voltage metering pump for your Tunze Osmolator Universal 3155 auto top off system.

    $23.99 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: $

    Aqua Lifter Vacuum Pump’s unique design lifts water with its diaphragm and flappers – pumping water up to 30” high and at a flow rate of 3½ gallons per hour. Ideal for use as a dosing pump for Kalkwasser, auto top offs, calcium reactors and other aquarium uses. …

    $59.99 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: $

    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: $

    …(PAT PENDING) * Dual platforms * Cable/Hose organizers * Protein skimmer section * Refugium section * Quick-connect dosing & ATO tubes * Four-position probe holder * Sapphire blue coloring with a white bottom to block light and prevent unwanted algae growth in other…

    $599.99 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…

    $339.99 Regular Price: $

    …perfect choice.   Features: * Extremely compact & quiet * Versatile media chamber * Compatible with Osmolator 3155 ATO * Surface skimming overflow * Built-in probe chamber * Adjustable Comline energy-saving pump * Patented magnetic mount …

    $76.49 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: $

    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: $

    Prevent overflows or equipment from running dry!   Customize your AutoAqua Smart ATO, ATO Micro, or AWC with your own pump. Just insert the male barrel plug into your Smart controllers pump port, plug the outlet into any wall socket, and then your pump into the Smart AC Socket. This…

    $30.00 Regular Price: $
    Out of Stock

    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

    $190.99 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: $

    …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…

    $6.99 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: $

    …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: $

    …to be replenished. With additional accessories, you can unlock features like auto water changes, provisions for magnetic stirrers, and even an ATO functions. GHL has even gone a step further making their illuminated logo on top of the dosing unit change colors as status transitions, letting you…

    $469.90 Regular Price: $