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    …this? One of the most popular ATO systems available. The JBJ A.T.O system is by far the mostcost-effectiveway 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…

    $92.00 Regular Price: $

    …to monitor your water level. The dual sensor design allows for the ATK to have one main water level sensor and the other as a backup should the first ever get dirty. On top of the optical sensors, a mechanical float valve is integrated into the pre-assembled water level mechanism that will protect…

    $224.95 Regular Price: $

    …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 Delay - 5 Minutes What's Included? 1x Smart Level

    $59.99 Regular Price: $
    Out of Stock

    …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. This sensor plugs into your FMM and, using reflected infrared light, will…

    $24.95 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: $

    …- 8 feet Max Mounting/Tank Thickness - 0.2" or 5mm - must be used on clear glass only Internal Dimensions - 1.4"L x 1.4"W x .6"H External Dimensions - 1.75"L" x 1.25"W Warranty - 12 Months Water level detection - Optical What's Included? 1x Sensor 60" Tubing 1x Power Supply 1x Pump 1x Tubing Holder

    $99.99 Regular Price: $

    …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 This sensor plugs into your FMM and,…

    $34.95 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…

    $279.99 Regular Price: $
    Out of Stock

    …meters of 9.5*12.5mm green PVC tubing 3x Transparent tube manifolds 4x Float level sensors and brackets 8x Magnets 1x 24V DC submersible pump 1x Male-to-male line 1.5 meters of 8*11mm transparent PVC connecting pipe for auto top-off 1x Anti-siphon connector ( straight) 10g Grease Quick start guide…

    $449.99 Regular Price: $

    …for carbon, GFO or any media of your choice. XPAquas 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 the intelligent QST programming to help prevent…

    $149.99 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…

    $214.99 Regular Price: $
    Out of Stock

    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: $
    Out of Stock

    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".…

    $109.99 Regular Price: $

    …reservoir for their water top off. Constructed from cell-cast black acrylic with beveled edges and featuring a clear front panel for easy water level monitoring, a hinged lid with knob for quick refills, and a pre-drilled 1.25 hole to run your pump plug; these slim ATO reservoirs make the perfect…

    $125.00 Regular Price: $
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    …reservoir for their water top off. Constructed from cell-cast black acrylic with beveled edges and featuring a clear front panel for easy water level monitoring, a hinged lid with knob for quick refills, and a pre-drilled 1.25 hole to run your pump plug; these slim ATO reservoirs make the perfect…

    $135.00 Regular Price: $
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    …reservoir for their water top off. Constructed from cell-cast black acrylic with beveled edges and featuring a clear front panel for easy water level monitoring, a hinged lid with knob for quick refills, and a pre-drilled 1.25 hole to run your pump plug; these slim ATO reservoirs make the perfect…

    $145.00 Regular Price: $
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    …reservoir for their water top off. Constructed from cell-cast black acrylic with beveled edges and featuring a clear front panel for easy water level monitoring, a hinged lid with knob for quick refills, and a pre-drilled 1.25 hole to run your pump plug; these slim ATO reservoirs make the perfect…

    $155.00 Regular Price: $
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    …exchange Auto shut off and 5min delay feature to turn off skimmer and avoid overflows Specifications: Height: 18" Diameter: 3.9" Footprint: 6.5" x 6.5" 5 minutedelay function keeps skimmer off an extra 5 minutes after power is lost. This feature allows the sump to return to its normal water level

    $230.99 Regular Price: $
    Out of Stock

    The Float Switch Level Sensor from designed for use with GHL Profilux aquarium controllers and the Doser 2.1 SA dosing pumps to provide constant water level monitoring for control of related aquarium equipment. This float switch can be used to trigger top off pumps or turn off equipment in an…

    $37.90 Regular Price: $

    …Optical sensors are great for precise level control and have no moving parts to wear out or become blocked, making them a reliable alternative to mechanical switches. Optical sensors are very versatile and great for a variety of water-monitoring applications. Auto Top Off with one or two Sensors…

    $82.90 Regular Price: $

    …reverse the operation by removing the clip, turning the float upside down and replacing the clip. 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 48" leads (22…

    $10.99 Regular Price: $

    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 Mounts with wires outside of chamber.…

    $15.99 Regular Price: $

    …RO Water Controller! The Tunze RO Water Controller 8555 is used to regulate the water level in your fresh water storage container. It uses two float switches to control an electronic valve. When the water level drops below the first float switch, the valve is opened allowing the container to fill…

    $214.99 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 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 the intelligent QST programming to help prevent overfilling.…

    $127.99 Regular Price: $

    …reservoirs have laser engraved water level markings so you can monitor how much water your tank is using. Dimensions: 6” long x 14” wide x 15” tall - Overall reservoir size 3 7/8" long x 6 3/8" wide - Opening to refill reservoir size An Auto Top Off container is perfect for holding…

    $124.99 Regular Price: $

    …reservoirs have laser engraved water level markings so you can monitor how much water your tank is using. Dimensions: 10” long x 16” wide x 15” tall - Overall reservoir size 3 7/8" long x 6 3/8" wide - Opening to refill reservoir size An Auto Top Off container is perfect for…

    $182.99 Regular Price: $

    …Sapphire, Ruby, and Emerald line of ATO reservoirs have laser engraved water level markings so you can monitor how much water your tank is using. Dimensions: 10” long x 16” wide x 15” tall An Auto Top Off container is perfect for holding a fixed amount of top off water. An…

    $189.99 Regular Price: $

    …reservoirs have laser engraved water level markings so you can monitor how much water your tank is using. Dimensions: 6” long x 14” wide x 15” tall - Overall reservoir size 3 7/8" long x 6 3/8" wide - Opening to refill reservoir size An Auto Top Off container is perfect for holding…

    $129.99 Regular Price: $

    …line of ATO reservoirs have laser engraved water level markings so you can monitor how much water your tank is using. Dimensions: 6 long x 14 wide x 15 tall - Overall reservoir size 3 7/8" long x 6 3/8" wide - Opening to refill reservoir size An Auto Top Off container is perfect for holding a fixed…

    $139.99 Regular Price: $

    …reservoirs have laser engraved water level markings so you can monitor how much water your tank is using. Dimensions: 10” long x 16” wide x 15” tall - Overall reservoir size 3 7/8" long x 6 3/8" wide - Opening to refill reservoir size An Auto Top Off container is perfect for…

    $198.99 Regular Price: $

    …Alone Doser with integrated control electronics. If the Slave Doser is driven by a ProfiLux with level control, a pump can also be used for automatic level control or auto top-off. All GHL Dosers are designed and made in Germany. From start to finish, we carry out the engineering-implementation…

    $419.90 Regular Price: $