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    …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…

    $149.99

    …thick walls.   An auto top off system is one of the first automated devices any reef keeper should have. When water evaporates, the salt is left behind slowly increasing the salinity of the tank. By utilizing an ATO device evaporated water can easily be replenished by the top off unit throughout…

    $134.99

    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…

    $99.99

    …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…

    $176.99

    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

    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

    …installation, a Socket Switch is included that allows you to run a pump up to 10A (1,200W). They even include a solenoid valve for aquariums that are topped off directly with an RO/DI system.    Features: World' First 4-Sensor ATO Low water level optical sensor Two sensor dual-stage overfill alarm…

    $199.99

    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

    …will turn off preventing catastrophe. Use as High or Low Level Peace of mind No Moving Parts Plug & Play Magnetic Attachment Easy to Clean Sensor Auto Time Delay 10-Foot Cable   Specifications: Max Power Output - 1100W @ 110VAC Max Mounting Thickness - 1/2" Power On Delay - 10 Seconds Detection…

    $59.99

    …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…

    $199.95

    …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…

    $176.99

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

    $84.99

    …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…

    $79.99

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

    $12.99

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

    $23.99

    …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

    $89.99

    …is pure and meets American Water Works Association and Water Chemical Codex requirements. Dosing with Kalkwasser is one of the very few proven, effective methods to add calcium and alkalinity with a single product while maintaining pH. Commonly used in conjunction with auto top off systems.

    Starting at:
    $12.99

    …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 commonly used for applications that don't require precise dosing.…

    $59.99

    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…

    $69.99

    Innovative Marine has designed 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…

    $69.99

    …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   Customize your…

    $39.95

    …range.    We do not suggest using this pump for auto top off systems. Due to the slow flow rate and the motor's long duty-cycle, it is best suited for intermittent use and we highly suggest using a pump with a faster flow rate for an Auto Top Off System.    What's Included? 1x Drew's Doser v2.0…

    $109.99

    …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. Having an auto top off system monitor and control the water level in your aquarium will lead to…

    $69.99

    …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…

    $104.99

    …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…

    $151.99

    …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…

    $119.99

    …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…

    $119.99

    …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…

    $23.00

    …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…

    $129.99

    …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…

    $184.99

    …the pump on your IceCap ATO with a Solenoid Valve Compatible with the IceCap ATO system. IceCap's ATO Solenoid Valve can work with a gravity fed auto top off reservoirs or just connect it directly to your RODI system. The solenoid valve will replace the pump that comes with the IceCap ATO system,…

    $23.00

    …but the PMUP will also now automatically shut off when it detects that it is running dry, but also over temperature protection.   Perfect for: Auto Top Off Carbon Reactors GFO Reactors BioPellet Reactors Ideal for Salt or Freshwater   Auto-Top-Off (ATO) ATO will likely be the most popular use for…

    $39.95