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    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…

    $69.99 Regular Price: $

    …dual-sensor ATO Two layers overfill protectionIntelligent QST programming Secondary optical sensor Super precise water level control Super easy installation; 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…

    $119.99 Regular Price: $

    …or hard wood floors. 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…

    $214.99 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 or .39".…

    $109.99 Regular Price: $
    Out of Stock

    The HYDROS ATO Kit comes with everything you need to add and manage automatic top-off through your HYDROS Controller. Using a HYDROS aquarium controller for your auto top-off system is not only a reliable solution but it also helps clear wire clutter in and around your aquarium. HYDROS Water Level…

    $79.99 Regular Price: $

    (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 created equal. Sadly, many ATO

    $199.95 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 Redundancy: Frequency…

    $99.99 Regular Price: $

    Why does BRS recommend this? One of the most popular ATO systems available. The JBJ A.T.O system is by far the mostcost-effectiveway 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 linkable brackets adjust…

    $92.00 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: $

    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 your aquarium topped off and…

    $149.99 Regular Price: $

    …agitation from causing fluctuating water levels.Everything included, just install and enjoy consistent water and salinity levels. The JBJ Nano ATO is the perfect upgrade for your aquarium. Specifications: Power Input - 120V AC, 60Hz DC Pump Max Head - 7.2 feet Pump Flow Rate - 74 gph Max Mounting…

    $109.00 Regular Price: $

    …to refill is now here. Just slide out the easy to access acrylic drawer and fill it with up to 15 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 15 gallon…

    $199.99 Regular Price: $
    Out of Stock

    …Systems 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 reservoirs…

    $139.99 Regular Price: $

    …low-level sensor as part of a dual-sensor automatic top-off (ATO) system. You could place these tiny optical sensors inside your dosing containers so you could be alerted when they need to be refilled. You could place a couple in an ATO reservoir: one can tell HYDROS to refill it and the other could…

    $39.99 Regular Price: $

    Build Your Own Auto Top Off System for your aquarium. Perfect for the DIY reefer who likes fun projects and wants to save a few dollars. Assembly requires only basic tools and no soldering. Basic knowledge of electrical wiring required. Aquahub DIY Top-it-Off Kit Premium Kit includes: (2) Aquahub…

    $45.99 Regular Price: $

    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" H 5 gallon capacity Slide out acrylic refilling drawer Rear opening for pumps and tubing Floating water line indicator Glass construction Most of the time ATO

    $129.99 Regular Price: $
    Out of Stock

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

    $25.99 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 tubes to be plumbed through, or wires for float switches. The Sapphire, Ruby, and Emerald line of ATO

    $189.99 Regular Price: $

    …over temperature protection. Perfect for: Auto Top 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: $

    …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. Dimensions: 6”…

    $129.99 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 fails.…

    $23.00 Regular Price: $

    …so if a motor or pump quits drawing current or draws too much, you will be immediately notified. Available Drive Port Accessories Auto Top-Off (ATO) pumps Cooling fans Cabinet LED lights Solenoids to control reverse osmosis systems Command Bus The HYDROS Control 2 includes two Command Bus ports…

    $199.99 Regular Price: $

    …Place your 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 aquariumas the kalkwasser solution is being dosed, not exceeding increases of 0.20 pH. Your ATO should…

    $17.49 Regular Price: $
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    …Versa is extremely 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 connectivity…

    $149.99 Regular Price: $
    Out of Stock

    …so if a motor or pump quits drawing current or draws too much, you will be immediately notified. Available Drive Port Accessories Auto Top-Off (ATO) pumps Cooling fans Cabinet LED lights Solenoids to control reverse osmosis systems Probe Port One of the most remarkable ports on the HYDROS Control…

    $449.99 Regular Price: $

    …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 disconnect your current pump from the controller and plug in the solenoid. It is that easy. The solenoid works in conjunction with the ATO controller…

    $22.99 Regular Price: $

    …over temperature protection. Perfect for: Auto Top 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…

    $39.95 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 on any type of…

    $34.95 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 Mounts with wires outside of chamber.…

    $15.99 Regular Price: $

    ATO reservoir. Features Reef Octopus red color accents (matches other Reef Octopus products) Solid acrylic construction Adjustable water depth from 5.1” to 9” Dedicated protein skimmer (and/or reactor) chamber Dedicated return pump chamber Dedicated freshwater reservoir with lid for ATO

    $629.99 Regular Price: $

    …of sight. The ventilated back panel keeps heat and humidity to a minimum so you can comfortably operate a small chiller, aquarium controller, or ATO inside of the stand. 20g Stand Specifications Dimensions: 18L 16W 36H Finish: High Gloss Black Weight: 60 lbs Whats Included? 20g High Gloss Cabinet…

    $199.00 Regular Price: $

    …Systems 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, Ruby, and Emerald line of ATO reservoirs…

    $129.99 Regular Price: $