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    …hobbyist has many challenges, but none is more annoying than the chore of adding water, every day, to make up for that lost to evaporation (a.k.a. topping off/up). This alone usually makes the automatic top-off (ATO) device the first piece of automation equipment purchased. The ironic flip side of…

    $224.95 Regular Price: $

    The AutoAqua Smart AWC Duo is an innovative 2-in-1 auto water changing and auto top-off system designed to simplify your tank maintenance routine. With its intuitive touch screen, Quick Security Technology and dual sensor failsafe, you can easily remove and replenish aquarium water both hands and…

    $307.99 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".…

    $114.99 Regular Price: $
    Out of Stock

    …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 Off Doser…

    $79.99 Regular Price: $
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    …notify you that your aquarium has not been topped off for an unusual amount of time, at least 24 hours, and double the average time between Top Off. Ex: if the Avg. time between topping off is 12 hours, the system will notify you after 24 hours of not topping off. Overfill Alert: The system develops…

    $99.99 Regular Price: $

    Enjoy a precise water level and peace of mind with the JBJ Dual Sensor auto top off system. With the included sensor cover you never have to worry about tank inhabitants causing false readings again, as an added bonus this cover will prevent sudden surface agitation from causing fluctuating water…

    $109.00 Regular Price: $

    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…

    $229.99 Regular Price: $

    …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 your water crystal clear. The overflow box easily mounts to any aquarium with its magnetic mount. It acts as a surface skimmer to rid your…

    $149.99 Regular Price: $

    …Tunze to connect to the Tunze Osmolator - the water valve replaces the pump with an electrically operated solenoid. Use it to control the flow of water from a tube rather than pumping it from a container like gravity-fed auto top off system. Max Water Pressure - 145 PSI (10 bar) Item #: 8555.200

    $104.99 Regular Price: $

    …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 and secure float switches, you will need to add your pump of choice, the JBJ ATO system is a great top off unitfor reefers on a budget.…

    $92.00 Regular Price: $

    …size 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 for a few days if not weeks, while not being too large to cause a big salinity swing or flood the sump if the top off pump…

    $144.99 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…

    $69.99 Regular Price: $

    The perfect All-In-One, Plug-and-Play Auto Top-Off solution for aquariums under 50 gallons As fresh water evaporates from your saltwater aquarium, the salt that is left behind begins to build in concentration. Auto top off systems help to restore osmotic balance in your aquarium by refilling the…

    $142.99 Regular Price: $

    The Kamoer X2SR is a WiFi-controlled, peristaltic pump designed for auto water changes and auto top-offs in your aquarium. Instead of manually transferring large buckets of water on maintenance days, you can program your X2SR to replenish water at whatever time or speed you like. You can change as…

    $494.99 Regular Price: $

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

    $28.29 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: $

    Quality Craftsmanship Where Form Matches Function Holds 4 Gallons / 15 Liters of fresh water for auto top off systems Hand-crafted, premium 100% acrylic construction Recessed flush mount lid with finger cutouts for easy removal Clear front panel with engraved graduated measurements Cutouts for ATO…

    $199.99 Regular Price: $

    Quality Craftsmanship Where Form Matches Function Holds 4 Gallons / 15 Liters of fresh water for auto top off systems Hand-crafted, premium 100% acrylic construction Recessed flush mount lid with finger cutouts for easy removal Clear front panel with engraved graduated measurements Cutouts for ATO…

    $199.99 Regular Price: $

    Quality Craftsmanship Where Form Matches Function Holds 8 Gallons / 30 Liters of fresh water for auto top off systems Hand-crafted, premium 100% acrylic construction Recessed flush mount lid with finger cutouts for easy removal Clear front panel with engraved graduated measurements Cutouts for ATO…

    $249.99 Regular Price: $

    Quality Craftsmanship Where Form Matches Function Holds 8 Gallons / 30 Liters of fresh water for auto top off systems Hand-crafted, premium 100% acrylic construction Recessed flush mount lid with finger cutouts for easy removal Clear front panel with engraved graduated measurements Cutouts for ATO…

    $249.99 Regular Price: $

    Quality Craftsmanship Where Form Matches Function Holds 16 Gallons / 60 Liters of fresh water for auto top off systems Hand-crafted, premium 100% acrylic construction Recessed flush mount lid with finger cutouts for easy removal Clear front panel with engraved graduated measurements Cutouts for ATO…

    $399.99 Regular Price: $
    Out of Stock

    Quality Craftsmanship Where Form Matches Function Holds 16 Gallons / 60 Liters of fresh water for auto top off systems Hand-crafted, premium 100% acrylic construction Recessed flush mount lid with finger cutouts for easy removal Clear front panel with engraved graduated measurements Cutouts for ATO…

    $399.99 Regular Price: $

    The Tunze Switched Socket Outlet connects any brand of pump to the Osmolator Universal 3155 Auto-Top off system. 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 can be used to switch…

    $82.49 Regular Price: $

    …or other additives in your ATO, they can lead to premature failure. Auto top off pumps can fail from time to time and having a back-up pump on hand is always a smart thing to do. Making sure your system keeps topping off for evaporation is one of the biggest keys to a stable and successful…

    $29.90 Regular Price: $

    The IceCap Gravity ATO is a compact and simple auto top off solution for those wishing to replenish evaporated water in their aquariums without dealing with pumps, sensors, or power cords. No electricity required for operation Ideal for small aquariums or sumps Simple to set up and operate How It…

    $17.99 Regular Price: $

    AutoAqua auto top off units now have the ability to hook directly up to a RODI 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…

    $29.89 Regular Price: $

    …size 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 for a few days if not weeks, while not being too large to cause a big salinity swing or flood the sump if the top off pump…

    $144.99 Regular Price: $

    …size 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 for a few days if not weeks, while not being too large to cause a big salinity swing or flood the sump if the top off pump…

    $209.99 Regular Price: $

    …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 for a few days if not weeks, while not being too large to cause a big salinity swing or flood the sump if the top off pump…

    $209.99 Regular Price: $

    …size 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 for a few days if not weeks, while not being too large to cause a big salinity swing or flood the sump if the top off pump…

    $124.99 Regular Price: $

    …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 for a few days if not weeks, while not being too large to cause a big salinity swing or flood the sump if the top off pump…

    $179.99 Regular Price: $

    …size 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 for a few days if not weeks, while not being too large to cause a big salinity swing or flood the sump if the top off pump…

    $154.99 Regular Price: $
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