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    …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 controller…

    $199.99 $159.99

    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". Max…

    $97.46 $77.97

    …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…

    $119.99 $99.99

      Why does 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 linkable brackets adjust…

    $84.99

    (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

    …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" H 5 gallon…

    $99.99

    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

    …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

    …Fresh & Saltwater Applications   What's in the Box 1x Hydrofill ATO Controller 2x Titanium Sensors Double sided adhesive 2x Rare earth neodymium magnetic sensor holders   Pump not included    HydroFill ATO Controller System Manufacturer's ManualHydroFill ATO Controller System Manufacturer's Specs  

    $69.99

    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…

    $149.99

    …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 $49.99

    …by the magnetic mount that holds the main level sensor and the high level safety sensor. Every IceCap ATO come withs a bright LED indicator, letting you visually see the status of your ATO.   Specifications: Max Tank Thickness - 1/2" Pump Max Head - 6 ft Pump Flow Rate - 50 GPH Pump Power…

    $126.99

    Prevent overflows or equipment from running dry! Using a tiny optical sensor, AutoAqua's Smart Level Sensor will cut power to the outlet when the sensor detects a change in water level. The plug & play design requires no difficult programming and the magnetic attachment makes placement and…

    $59.99

    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 sump from running…

    $199.99

    …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 15 gallon capacity…

    $149.99

    Auto Water Change Plus Auto Top Off    Change your reef tank's water automatically with AutoAqua's AWC system. AWC & ATO All-In-One. Water changes are one of the most time-consuming maintenance tasks with saltwater aquariums. There has been plenty of debate over how much water you should change and…

    $209.99

    Replacement pump for Tunze Osmolator Universal 3155 auto top off system.

    $23.95 $19.16

    …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

    Red Sea Aquarium kits are drop ship items only. Due to their size we are unable to have them on hand in our warehouse. All drop ship orders will be placed with BulkReefSupply.com will be submitted to the manufacturer within 2 business days of receiving the order. Red Sea only drop ships tanks on…

    Starting at:
    $3,699.00

    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.   BRS Top…

    $79.99

    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 is the perfect…

    $30.00

    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.   The Aqua Lifter Vacuum Pump is…

    $59.99

    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

    …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

    The Tunze Switched Socket Outlet connects any brand of pump to the Osmolator Universal 3155 Auto-Top off system. In the Osmolator and Osmomat, 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…

    $71.53 $57.22

    …to 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”…

    $104.99

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

    $176.99

    …all the skimmate from flowing back into your aquarium.    Suggested Sensor Locations: Under the Stand Under Carpeting Under RODI Systems Next to ATO Reservoirs Above Protein Skimmer Lids Under Potential Leak Points Next to External Equipment   What's Included? 1x FMM Module 2x LD-2 Solid Surface…

    $149.95

    …water level in the sump box. Accepts the Modular Return Pump Basket Filter Creates a steady water level for the protein skimmer Perfect spot for ATO sensors Titanium clamping Screws Crystal clear acrylic   The Modular Return Pump Basket Module fits perfectly in the Somatic line of Filter Systems…

    $49.99

    …Each ATO reservoir has two 0.25” OD holes for ato plumbing or wires for float switches.   Dimensions: 10” long x 16” wide x 15” tall   An Auto Top Off container is perfect for holding a fixed amount of top off water. An appropriately sized ATO reservoir would be able to supply your tanks ATO needs…

    $151.99

    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 Don’t use in heavy duty applications like sewage pumps. Great…

    $10.99

    Perfect for controlling your RODI system, top off system, calcium reactor, or other low flow items that use 1/4" tubing. The solenoid valves uses the 24V accessory port found on 1Link modules and the EnergyBar 832.   Solenoid Valve (SV-1) This 24VDC powered, normally-closed (NC), solenoid valve has…

    $29.95