Auto Top Off

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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…

    $229.99 Regular Price: $

    …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 and…

    $99.99 Regular Price: $

    …point, the pump will be activated until the water hits the next sensor. Fill Level:1" above the low-level sensor, this sensor turns the fill pump off when it detects water. High Level:1" above the fill level, and 2" above the low-level sensor, this sensor deactivates the pump when it senses water.…

    $69.99 Regular Price: $

    With huge features jammed in a tiny package, the Duetto is the perfect ATO for your aquarium. XPAqua’s proprietary dual-optical sensor packs two precise level sensors in one incredibly small package. In addition to keeping your water level constant, the two sensors also work in concert with…

    $127.99 Regular Price: $

    …for your auto top-off system is not only a reliable solution but it also helps clear wire clutter in and around your aquarium. While this ATO system does require the HYDROS system to function, if you already have a HYDROS aquarium controller, this is a very economical add-on to manage water top off

    $79.99 Regular Price: $

    …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 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 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: $

    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: $

    …to fail prematurely. RO/DI System with an Auto Shut Off Valve - The solenoid valve can be placed anywhere after your DI and before the water enters your reservoir. This method will let you use your RODI system like normal if you split the RO or DI water off to any other reservoirs while allowing the…

    $69.99 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: $

    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: $

    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: $

    …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: $
    Out of Stock

    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…

    $52.99 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 easiest top off reservoir 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…

    $219.99 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 were…

    $124.99 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: $

    The HYDROS Water Level Sensor is an optical sensor you can use for a variety of aquarium applications, such as sensing when your tank needs to be topped off or to detect when a dosing container needs a refill. The optical eye is magnetically coupled with the magnet side measuring only thick. It can…

    $39.99 Regular Price: $

    Modern & compact magnetic water level monitoring Improved look, feel, and design Precise water level control Built-in magnetic mount Silicone-encased external magnet Completely waterproof Compact form factor fits into tight spaces Strong magnetic mount suitable for glass or acrylic up to 1/2"…

    $39.95 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: $

    …Ports Track temperature and pH with included lab-grade, double-junction probes Monitor water level with new MOS Magnetic Optical Sensor Stay on top of leaks with LD-2 Leak Detection Floor Sensor Set reminders, log testing and dosing information, and access your tank from anywhere with Apex Fusion…

    $599.95 Regular Price: $
    Out of Stock

    …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 were…

    $179.99 Regular Price: $

    The easiest top off reservoir 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…

    $142.99 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 were…

    $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 were…

    $218.99 Regular Price: $

    …and dosing tube holders round out the mainstays for a really well rounded sump design. Features: High quality full cast acrylic construction and full top support brace Quiet water flow operation design Interchangeable floss filter box and filter sock holder Removable heater holder, test probe holder…

    $389.99 Regular Price: $

    …and dosing tube holders round out the mainstays for a really well rounded sump design. Features: High quality full cast acrylic construction and full top support brace Quiet water flow operation design Interchangeable floss filter box and filter sock holder Removable heater holder, test probe holder…

    $359.99 Regular Price: $

    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…

    $33.00 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: $

    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: $
    Out of Stock
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