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    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 an single sensor to monitor water levels and a controller that protects against overdosing. Magnetic holder for sensors up to 10mm or .39". Max…

    $99.37

    …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

    Why does BRS recommend this? Bulk Reef Supply tried many different water level switches and auto top off solutions before giving the Tunze 3155 Osmolater Universal Auto Top Off BRS Recommended status. Despite its higher price this is by far our favorite solution. Spending the extra money on a Tunze…

    $199.99

    Innovative Marine is always offering the latest in aquarium technology. The new Hydrofill titanium ATO controller utilizes conductivity sensors making it a perfect auto top off controller for either fresh or saltwater aquariums. Hauling buckets, and daily refilling are now a thing of the past.…

    $69.99

    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.

    $39.95

    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…

    $79.99

    The safest standalone ATO on the market! The Neptune ATK System comes with everything you will need to get an automatic top off system up and running within minutes. The ATK can be used on its own without the necessity of an Apex Controller, but if you have an Apex, the ATK will integrate seamlessly…

    $199.95

    …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 disconnect…

    $22.99

    Everything you need to install a reliable Auto Top Off System! Dual Optical Sensors Magnetic Sensor Mounts Compact Design DC Feed Pump Fail-Safe Protection No Moving Parts

    $124.99

    …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 included 4" x 1" opening in the back and you are ready to top off. Dimension - 8" L x 12" W x 19" H 5 gallon capacity…

    $99.99

    …a low voltage, high performance air lift pump specifically for auto top off controllers. The Auqa Gadget HydroFill ATO Pump System works with the HydroFill ATO Controller System or ATO of your choice. Complete with Lift pump, return pipe and acrylic Max output of 15 GPH Max Head: 5 Ft Self-priming…

    $69.99

    …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” long…

    $99.99

    …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: 10” long…

    $145.99

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

    $23.49

    Great for small tanks and where space is limited - the Smart ATO is a compact controller and sensor in one unit to keep you water at a safe level while maintaining proper salinity. Powerful magnets hold the unit in place at the desired water level in your tank or sump. Music alarm sounds if unit…

    $159.99 $144.99

    Why does BRS recommend this? Most float switch brackets can swing around or change level by just simply bumping them with your hand or arm.  The Deluxe Madison Horizontal Mount Float Switch is just a typical float switch however the greatest part is that it has standard ½” NPT Male threads for…

    $18.99

    Somatic by Vertex Add the Auto Top Off Module to your Somatic Sump and remove the daily chore of topping off your aquarium.  Reliable float valve Float Valve is adjustable Sits on top of the Somatic 120 Sump Box Holds over 2.5 gallons Made of thick acrylic

    $59.99

    …Trigger 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 have…

    $114.99

    Optical sensors are the go-to sensor if you want a reliability over a long period of time. The Neptune Optical Sensor plugs directly into the FMM allowing you to monitor the level of your sump, mixing station, or any other reservoir that has up to 1/4" thick walls. Includes Magnetic Mount Neptune…

    $34.95

    …we highly recommend investing in the PM2 module and salinity probe. Add the Salinity Module: PM2 to your Apex Neptune System. Real-time monitoring of salinity in reef aquarium Module has extra Temp Probe port I/O Switch Inputs for ATO, feed buttons, leak alarms, etc. Probe Sold Separately.

    $84.95

    Somatic by Vertex Four tube dosing line or ATO tube holder that is designed for the Somatic 60 Filtration System. Attaches directly to the sump wall Installs in seconds Hold up to 4 tubes Titanium Screws

    $26.99

    …your return pump and also helps your protein skimmer filter more efficiently by keeping a steady 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

    $49.99

    The AuqaGadget Titanium Hydrofill ATO Return Bracket is by far the quickest and easiest way to complete any ATO system. The crystal clear bracket will allow the custom made "J" tube from kinking and also keep it in stationary. Just position the bracket, and tighten the locking screw to secure the…

    $22.99

    …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

    $114.99

    …controller an easy way to 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 detection

    $39.95

    …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

    $114.99

    Optical sensors are the go to sensor if you want a reliable sensor over a long period. The Neptune Optical Sensor plugs directly into the FMM allowing you to monitor the level of your sump, mixing station, or any other reservoir with liquid in it.

    $24.95

    Sicce's MicraPlus pump is a fully submersible, compact pump with suction inlet is on the bottom for optimum operation with low water levels. Small size is great for indoor or outdoor fountains, aquariums and terrariums. Output: 158 GPH Max Head Height: 2.8 Ft Flow Regulator Power Consumption: 6.8W…

    $30.99

    The 1/8" NPT plastic nut will work with the vertical Deluxe Madison Float Switch and the Float Switch with Splash Guard. It can be really hard to find a 1/8" NPT nut locally and we now stock them in our warehouse.

    $.99