Marine Depot now offers FREE economy shipping with no minimum purchase for 99% of the products we carry! Orders under $299 are shipped FREE using a mix of economy shipping methods including USPS First Class Mail, SurePost and UPS Ground. These shipments are typically delivered in 5-7 business days. Orders placed Monday-Friday before 10:30 am PST are shipped the same day. This offer is valid for orders shipped within the contiguous U.S. only. Frozen foods, live foods, and items shipped directly from the manufacturer do not qualify for this special offer.
$4.99 Upgraded 1-5 Day Shipping (FREE for orders $299+)
This is the shipping method most Marine Depot customers are accustomed to and is really the sweet spot for service and value. Thanks to our two strategically placed warehouse locations, over 90% of Marine Depot shoppers receive their orders within 2 business using this level of service (UPS Ground).
UPS Ground shipping is available for only $4.99 but is FREE with orders over $299. This shipping upgrade speeds delivery time to 1-5 business days. This offer is valid for orders shipped within the contiguous U.S. only. Frozen foods, live foods, and items shipped directly from the manufacturer do not qualify for this special offer.
Frozen foods are delivered 1-3 business days from the day your order ships. Frozen foods are shipped every Monday and Tuesday. Shipping cut-off is Tuesday at 10 am PST (1 pm EST). Orders received after 10 am PST on Tuesday will be shipped the following week. Shipping and handling is a $19.99 flat-rate charge so you can order as much or as little as you like.
Orders not shipped within the contiguous United States—the 48 U.S. states on the North American continent south of Canada plus the District of Columbia—are considered international orders. International orders are not eligible for Marine Depot’s free shipping promotions and additional surcharges may apply. It is important to note that not all products we carry can be shipped internationally. Any brokerage fees, tariffs and/or taxes will be billed to you directly by the shipping courier. International customers must use the same billing and shipping address.
The Sentry is a professional grade two- OR one-channel reef aquarium dosing pump that comes complete with all the equipment you need to automatically nourish, balance and protect the environment of your reef aquarium.
Two separate channels, pH Controller & Float-Switch compatibility. Large RED LED display, internal rechargeable backup battery, compact size, quiet, dependable performance dosing as little as 0.3 ml./hour up to 85 ml./hour when used to dose 2-part calcium/alkalinity additives. Also included is a higher-flow (3–800 ml./hour) one-channel tubing set capable of adding up to 5 gals./day. Can easily be used for either night-time only kalkwasser dosing, 2-component dosing or makeup-water additions.
Specifications
Two-Channel Capability Built In, with digitally adjustable dosing rates from .15 ml. to 85 ml./hour per channel when used with the included 2-channel tubing set.
Float Switch Compatibility. A float switch is available as an accessory, and can be plugged into the control jack in the back of the pump. The float switch is connected to transistor-level voltage, providing safety and dependability.
High Volume One Channel System. The Sentry is also made to be used as a one-channel makeup water doser. Using the included long-life tubing set, the Sentry will pump up to 800 mL per hour, or up to 5 gallons per day.
Controllable—Using the optional A/C control interface, the Sentry can easily be controlled by other devices, such as pH controllers, electronic float switches or aquarium monitoring systems.
24/7 operation—Thanks to the Swiss-made motor and the Sentry is DESIGNED for 24/7 operation 365 days a year.
Accuracy and Tubing Life- by utilizing a heavy-duty, Swiss-made motor and precision gear drive system, the Sentry pumps at a constant rotor speed of 12 rpm when set at 300. For slower rates, the timing cycle is changed but the rotor speed remains constant. Since it does not rely on friction to drive the pumping mechanism, the output of the pump will remain stable over very long periods of time, and it’s also non-siphoning. Also, since the rotor moves at such a slow speed, tubing life is significantly better than that of higher-speed, gear-less pumping systems. Typical tubing life is 6 months for a two-channel system.
Built-In Battery Backup—The built-in nickel cadmium battery pack will power the pump for over an hour, providing peace of mind during power outages or in moving the equipment. The settings not only stay in memory, but the pump will actually run on the battery for over an hour. When turned off, the memory of the last rate setting remains in the pump electronics for 24 hours, so when turned back on, it rapidly returns to the previous setting.
Bright LED Display—Easily visible from a distance or underneath darkened cabinets. Quiet Operation. This pump runs exceptionally quietly, making less noise than most desktop computers.
Manufacturer Warranty: Guaranteed against mechanical or electronic defects for 2 years, both parts and labor. Damage by moisture or customer abuse of the equipment is not covered.
Ask a Question Earn 15 Points when you answer a question
Over the last 20 years I've owned many different dosing pumps in all different price ranges. I have gotten rid of them all and now own 4 of these wonderful pumps. These are the only pumps I will use on my 300 gallon reef, as well as the ATO on my 60 gallon cube. The Sentry is a no frills incredibly ...Read More
Over the last 20 years I've owned many different dosing pumps in all different price ranges. I have gotten rid of them all and now own 4 of these wonderful pumps. These are the only pumps I will use on my 300 gallon reef, as well as the ATO on my 60 gallon cube. The Sentry is a no frills incredibly accurate workhorse. Its a refurbished medical dosing pump. I figure if its good enough for hospital usage, then I can trust it on my reef. NOTE: It is important that you read the instructions carefully, this pump can be very versitle if you know how to use it.Hide
I bought this pump to dose small amounts of additives into my reef. Like most advanced aquarists (I hope) the pump was programmed into my controller (Apex) to try and tweak the amounts added. I will say that the pump is easy to set up, consistent in its dosing, and relatively quiet. Two major dra...Read More
I bought this pump to dose small amounts of additives into my reef. Like most advanced aquarists (I hope) the pump was programmed into my controller (Apex) to try and tweak the amounts added. I will say that the pump is easy to set up, consistent in its dosing, and relatively quiet. Two major drawbacks, particularly for this price, is that it cannot be controlled by the Apex (or any other controller) and the battery backup it has. The manufacturer essentially took a hospital IV pump and slapped a sticker on it that reads reefdosingpumps.com. A battery backup is good when grandpa is getting his antibiotics and the power goes out but in reefing if the power goes out you probably do not want additives to continue to be added, may it be because of a power failure or because a controller turned it off. I have a float switch that came with it that was made from the microphone jack used in computers. Despite its positives I have to give this pump a low rating for the little thought the manufacturer gave to reefing in particular- if you cannot control the pump then it should not have a battery backup. After a power failure you need confirmation that the system is OK and not to be "reliably" dosing additives.Hide
I have a Sentry but want to give a warning I think all should be aware of. If you are dosing something, kalkwasser or whatever, and it is dosed with a controller, if you loose power the controller will no longer be able to direct the sentry doser which will operate by the battery back-up and continu...Read More
I have a Sentry but want to give a warning I think all should be aware of. If you are dosing something, kalkwasser or whatever, and it is dosed with a controller, if you loose power the controller will no longer be able to direct the sentry doser which will operate by the battery back-up and continue to dose. Keep this in mind. Nice system but can overdose your tank if you loose power and am away.Hide
This a is a very easy pump to setup. The pump is super quite and is perfect for the to part dosing that I am doing on my reef tank. The Pump was missing the light sensor and I called Innovative aquatics and Stan is shipping me the part right away. So very good customer service.
Most products ship free—no minimum purchase required
We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in 5-7 business days.
upgrade your shipping for only $4.99—free upgrade for orders $299+
Over 90% of our members receive their orders within 2 business using UPS Ground. Upgrade from free economy shipping to UPS Ground for only $4.99—or spend $299 and we’ll upgrade you automatically!
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Same-day shipping is available Monday-Friday for most products—place your order by 10 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.
live plants, live foods, and frozen foods delivered to your door
We ship live plants, live foods, and frozen foods within the contiguous United States. Each of these categories is subject to its own $19.99 flat-rate shipping fee to cover the special packaging and/or expedited shipping costs required to ensure safe delivery. Orders with 12+ live plants ship free!
Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.
A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.
Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.
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