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    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

    Xp Aqua's Sumpless ATO - Complete ATO & Surface Skimmer for Sumpless Aquariums    Sumpless ATO is the first and only ATO designed specifically 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…

    $149.99

    Now Includes Siphon Break One of the smallest all-inclusive auto top off systems on the market today. 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…

    $134.99

    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

    A Complete, Simple, & Standalone ATO! If you want a safe ATO system, the Neptune System ATK v2 uses a mixture of optical eyes and a float valve to ensure your tanks water level stays the same while preventing overfills. With the ATK v2 you do not need an Apex Controller since it can be run 100%…

    $199.95

    Choose the Aquatec Auto Flush Flow Retrictor that meets your RODI systems flow rate. 300 mL/min 400 mL/min 500 mL/min for 75 GPD single membranes or 150 GPD Water Saver Systems 600 mL/min 700 mL/min 800 mL/min for 100 & 150 GPD single membranes or 200 GPD Water Saver Systems   The Aquatec Auto-Flush…

    Starting at:
    $54.99

    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…

    $30.00

    The AuqaGadget Titanium Hydrofill ATO Return Bracket is by far the quickest and easiest way to complete any ATO system. The low profile return bracket from Innovative Marine will keep your top off tubing secure and kink free. The crystal clear bracket will allow the custom made "J" tube from kinking…

    $22.99

    …float valve. ASOVs do require a minimum of 40 PSI to operate correctly and can be installed on any style of reverse osmosis system that uses 1/4" tubing.   Auto Shut Off Kit Includes: Float valve 5ft of tube Inline check valve 1/4" auto shut off valve   Auto Shut Off Valve Installation Instructions

    $24.99

    …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

    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 the…

    $119.99

    …Available: 75 GPD Auto Flush Flow Kit - Compatible with 75 GPD membranes or 150 GPD Water Saver systems. Kit includes a 500ml/min Auto Flush Flow Restrictor. 100 GPD Auto Flush Flow Kit - Compatible with 100 GPD membranes or 200 GPD Water Saver systems. Kit includes an 800ml/min Auto Flush Flow…

    Starting at:
    $104.99

    …utilizes the back pressure created by the float valve or pressurized tank to shut off the water supply to the membrane. Without an automatic shut off valve waste water would continue to run out after the float valve is activated or tank becomes full.   Auto Shut Off Valve Installation Instructions

    $9.99

    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

    …approx. 4300 mL/145 oz of collection Extra chamber for collecting skimmate Carbon filter cup to help reduce odor - easily removed for carbon exchange Auto shut off feature to turn off skimmer and avoid overflows   Item #: OCT-WC140   Height: 21.75" Diameter: 5.5" Footprint: 8.3" x 8.3" Drain line…

    $234.99

    …approx. 1400 mL/49 oz of collection Extra chamber for collecting skimmate Carbon filter cup to help reduce odor - easily removed for carbon 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…

    $219.99

    Xp Aqua's Ultimate ATO - The most complete ATO on the market    With 2x dual-optical sensors, the Ultimate ATO is the first ATO to include 4 sensors. The 4 sensors allow a dual-stage overfill alarm that is less intrusive as well as a run-dry protection feature that prevents your sump from running…

    $199.99

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

    $23.99

    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

    …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

    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

    Check valves only allow water to flow one direction. 1/8" Male NPT x 1/4" Push Connect elbow check valves are typically used on the product water output of RO membrane housings to protect from back pressure and allow auto shut off valves to operate correctly.

    $3.99

    …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

    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

    …detects pressure build up caused from your holding container becoming full. Most often triggered with a float valve Your system must have a working auto shut off kit for this switch to work properly. ¼” Push Connect fittings Preset at 40 PSI Adjustable (30-60) PSI "trigger point" for application…

    $19.99

    …use the Manual, Quick Set or Auto mode. Manual Mode - Tune the light for customized spectrums and intensities that can be viewed instantly.  Quick Set - Create your own 24-hour custom lighting cycle that can be repeated daily with up to 6 different set points. Auto Mode - Replicate seasonal growing…

    $109.00

    …continuous operation out of the Smart ATO pumps, but if you use kalkwasser 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…

    $23.00

    …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…

    $69.99

    …switches.   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 amount of top off water. An appropriately sized ATO reservoir would be able to supply your tanks…

    $104.99

    …needed. Each ATO reservoir has two 0.25” OD holes for ato plumbing or wires for float switches.   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 appropriately sized ATO reservoir would be able to supply your tanks ATO…

    $151.99

    …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

    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…

    $22.99