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    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 $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 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 $84.46

    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 $67.99

    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

    …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 $107.99

    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 $33.96

    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 $59.49

    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 $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 $124.09

    …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 $97.74

    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 Mount with wires outside of chamber

    $15.99 $13.59

    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. 12 month warranty offered by Bulk Reef Supply.

    $79.99 $67.99

    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 $26.34

    …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

    $169.99 $144.49

    Why does BRS recommend this? The Cobalt MJ line of pumps is great for auto top off systems, reactors, or low flow equipment.  These pumps are made in Italy and are much quieter in operation than similar pumps that appear to be identical.  With so many applications the Cobalt MJ pumps have some of…

    $34.99 $29.74

    …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 $18.39

    Recommended for water applications like level controllers, auto top systems or other aquarium uses Normally closed or normally open (see more) Float magnet is encased inside the float 24" leads (22 gauge wire) offer project flexibility M8 fitting – self sealing. Now includes nut.

    $28.99 $24.64

    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 $50.99

    Replacement Santoprene tube for the BRS 2 Part and BRS Top Off Doser.

    $12.99 $11.04

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

    $23.49 $19.97

    …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 $59.49

    …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 $42.49

    Tunze Osmolator Switched Socket Outlet connects any brand of pump to the Tunze Osmolator Universal 3155. Great if you would like to replace the low-voltage centrifugal pump with a more powerful pump.

    $87.91 $74.72

    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 $19.54

    …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 $89.99

    …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 $84.99

    Recommended for water applications like level controllers, auto top systems or other aquarium uses Normally closed or normally open (see more) Float magnet is encased inside the float 24" leads (22 gauge wire) offer project flexibility M8 fitting – self sealing, does not include the nut. You will…

    $27.99 $23.79

    Recommended for water applications like level controllers, auto top systems or other aquarium uses. Normally closed or normally open (see more) Float magnet is encased inside the float 24" leads (22 gauge wire) offer project flexibility 1/8" NPT tapered fitting - does not come with a nut…

    $14.49 $12.32

    Modular, Multi-Purpose, Magnetic Innovative Marine CustomCradle probe holders are clutter free and one of the easiest probe holders to use, and maintain. Thumb screws are a thing of the past with the magnetically coupled, padded probe and dosing tube holder. A single CustomCradle can hold probes,…

    $29.99 $26.99

    The Perfect ATO PUMP - No Apex Necessary The Neptune PMUP-T (Practical Multi-Purpose Utility Pump with Power Supply) is great for providing water to feed carbon reactors, and most importantly it can be used as a top off pump. The PMUP-T can be plugged directly into any outlet, timer, or controller…

    $49.99