4-in-1 canister filter with mechanical, chemical & biological filtration - plus UV sterilizer
Built-in UV sterilizer destroys harmful bacteria and more
Integrated UV sterilizer takes this canister filter to the next level
Enhance aquarium filtration with Reaction large-capacity, 4-stage canister filters. Revolutionary canister filters boast greater media-storing capacity so aquarium water comes into contact with more filter media during the initial pass. Combined with a built-in 5W UV sterilizer, you enjoy clean, clear, and healthy aquarium water from a single, space-saving unit. Advanced, high-performance features help ensure high water quality plus quick and easy routine filter maintenance. 5/8" intake and return.
Large, customizable media baskets - Hold more chemical and biological media. Easy-to-remove basket trays have convenient handles for removing and loading all types of media.
Integrated self-priming lever - Eliminates the need for manual siphoning. Simply pump the lever up and down to prime the Reaction 4-Stage Canister Filter.
Integrated quick disconnect shut-off valve - Instantly creates a watertight seal that stops water from entering or exiting the filter.
ON/OFF switch for UV lamp - Allows independent control of the UVC germicidal lamp to destroy green water and polish water to crystal clarity.
Includes: Fine Filter Sponge, Coarse Filter Sponge (except EFU-25), 500 grams activated carbon, and 500 grams ceramic bio-filter rings.
Aquarium Size up to
Total Media Capacity
11.41" x 11.41" x 15.25" h
11.41" x 11.41" x 17.52" h
11.41" x 11.41" x 19.8" h
Please click on "More Information" for installation instructions.
Unpacking the box
Carefully unpack your new Reaction Canister Filter and verify parts.
Choosing a location
Reaction 4-Stage Canister Filters are gravity-fed filter systems. They must be placed below the water level in order to function properly.
Attach Inlet J-Tube to Strainer/Pre-filter and hang inside of aquarium.
Attach Return U-Tube to Connector and Elbow Connector and Return Nozzle. Hang inside aquarium. Note: Spray Bar can be attached instead of Return Nozzle as another return option.
Insert the Inlet J-Tube and Return U-Tube into the two pre-cut Hoses. Align the other open ends of the hose to the Inlet/Outlet Valve and cut hoses if necessary so there are no kinks or bends.
Once cutting of the hoses has been completed, measure the distance from the aquarium to the canister filter to ensure the hoses are the right length.
Removing the Cover
Unsnap the two handle clamps outward and up.
Unsnap the remaining 2 handle clamps outward.
Continue to pull outward and up until the cover detaches from filter body.
Preparing the Media Baskets
Your filter is factory-installed with the correct sponges, carbon, and ceramic rings to show proper placement. It is necessary to remove the baskets and rinse the activated carbon bag under the sink for 30 seconds or until the water runs clear before starting the filters.
Filling the Canister Filter
Once the activated carbon bag has been rinsed, place back into the filter basket and fill up with aquarium water to 95% of the capacity of the filter. Clamp cover back on to the filter body by repeating the steps in opposite order. Always check to ensure you have an airtight seal and that each handle clamp is locked in place before turning on the filter. Note: The Quick-Disconnect Valve handle must be in the horizontal position in order to lock properly.
Turning on the Filter
Plug the receptacle of the filter into a grounded outlet. At this time, you should be able to hear the motor running. Pump the Integrated Priming Lever up and down vigorously until the air inside the canister filter escapes out the return hose. Once the filter is running, return the lever to the "Down" position.
Adjusting the Water Flow
The Reaction Canister Filter's unique Quick Disconnect Valve offers the option to regulate water flow for your aquarium. While the filter is running, you can slowly raise the handle to reduce flow rate. Note: It is very important NOT to raise the handle more than halfway. Raising the handle more than halfway may stop the flow of water and cause malfunction to the motor and associated parts.
Adjusting the Water Return
Adjust the height or angle of the Return Hose back into your aquarium to your specific needs. If you selected to use the Return Nozzle, you can turn the nozzle to face upwards for more surface movement or downwards for more movement at the bottom of the aquarium. If you selected to use the Spray bar, adjust it so the small openings in the Spray Bar are positioned at a 45-degree angle so the retuning water breaks the water surface for more gas exchange.
Regular maintenance is the key to a successful, thriving aquarium. Maintaining an aquarium can be very easy with a regular cleaning schedule. Water changes should be carried out on a monthly to bi-monthly schedule depending on the biological load of your aquarium. A 25% water change with gravel vacuuming is essential to keep dissolved organic carbons to a minimum.
Periodic filter media replacement is crucial for the well-being of your livestock. As most mechanical and chemical media are exhausted, they slowly lose performance and no longer filter the water efficiently. It is recommended to replace the mechanical and chemical filter media located inside the baskets on a monthly basis.
Close the Quick Disconnect Valve by lifting up on the handle. The handle should be in the vertical position to stop the flow of water in and out of the filter.
Unplug the filter power cord.
Lift up on the handle of the Quick Disconnect Valve and disconnect from the filter body. The water inside the hose tubes will not leak.
Lift the Reaction Canister Filter from the main body (not the cover) and carry to a sink or drain to perform cleaning and maintenance.
Unlock the Handle Clamps and remove cover carefully.
Drain as much water out of the filter and remove baskets individually.
Replacing the Fine White Filter Floss
The White Filter Floss should be changed on a monthly basis to remove small, trapped debris and free-floating particulate matter.
Replacing the Coarse Black Sponge
The black Coarse Sponge should be changed on a monthly basis to remove medium to large trapped debris and free-floating particulate matter.
Replacing the Activated Carbon Bag
Activated carbon adsorbs dissolved pollutants and removes the yellow discoloration of water as well as associated odors. Replace the Activated Carbon Bag on a monthly basis.
Cleaning the Ceramic Rings
The Ceramic Rings are the primary biological support for keeping toxic ammonia and nitrite at acceptable levels. Generally, the biological media should not be replaced unless detritus and waste is prohibiting the amount of exposed surface area available for the beneficial bacteria. Clean Ceramic Rings with aquarium water and never use tap water that can destroy the bacteria.
Replace Ceramic Rings as needed or add extra for higher volume aquariums with large bio-loads.
Cleaning/Replacing Impeller Step 1: Remove cover from the filter and place upside down. You will then need a flat head screwdriver.
Step 2: Wedge the flat head screwdriver under the Impeller Cap Tab and lift up.
Step 3: Remove the Impeller Cap Tab.
Step 4: Disconnect the Return Elbow from the UV Housing by pulling in a counterclockwise motion.
Step 5: Pull out Impeller for cleaning or replacement. It may be necessary to also clean out the Impeller Housing with a cotton swab to remove slime and detritus accumulation.
Replacing the UVC Lamp
The UVC lamp within the Reaction Canister Filter requires replacement after 9 to 12 months of use. Always disconnect the power supply and NEVER look directly at the lamp.
Tools Required: Phillips screwdriver, scissors, and pliers.
Step 1: Unscrew the (6) Phillips screws from the underside of the cover.
Step 2: Unscrew the (2) Phillips screws from the topside of the cover.
Step 3: Pull off the Suction Cup from the underside of the Priming Lever.
Step 4: Unscrew the nut from the Priming Lever and pull out the Lever from cover top.
Step 5: Pull apart the internal black plastic frame from the top frame.
Step 6: Cut the clear zip tie with your scissors to allow more slack to remove the UVC Lamp. The wires should be re-attached with wire or another zip tie for organization.
Step 7: Disconnect the Male/Female Plug that is connected to the UVC Lamp.
Step 8: Loosen the Compression Fitting with pliers and unscrew by hand. Unsnap UVC Lamp from the Lamp Holder and replace UVC lamp.
Reaction 4-Stage Canister Filters are the latest innovation in high capacity filtration systems. These revolutionary canister filters incorporate high media-storing capacity with easy-to-remove basket trays, self-priming lever, quick disconnect shut-off valve for convenient media replacement. They also feature an integrated UV sterilizer, with an ON/OFF switch, that polishes water to crystal clarity while keeping pathogens at bay.
Reaction 4 Stage Canister Filters utilize mechanical, chemical, and biological filtration plus UV sterilization for a balanced aquarium. Water enters the canister filter via the intake strainer and is guided through a large sponge to trap particulate matter. The water then reaches 500 grams of activated carbon to remove harmful dissolved organic compounds. Water is directed over the ceramic rings that offer a tremendous amount of surface area (internally and externally) to grow beneficial aerobic bacteria that break down harmful ammonia and nitrite to nitrate. All filtered water then passes through the powerful UVC lamp for pathogen and green water elimination.
Reaction 4-Stage Canister Filters are equipped with the most advanced features to provide high performance and make routine maintenance quick and easy.
Integrated self-priming lever
The innovative self-priming lever eliminates the need for manual siphoning. Simply pump the lever up and down vigorously until the water enters the inlet and the remaining air bubbles leave the outlet.
Quick disconnect shut-off valve
This is the most useful feature to keep floors dry when carrying out routine monthly maintenance. The quick-disconnect shut-off valve is an integrated tool that instantly creates a watertight seal that stops water from entering or exiting the filter. Simply lift up the shut-off valve handle to the vertical position to stop water flow. Grab the handle and detach and take the canister filter for convenient media replacement.
ON/OFF switch for UVC germicidal lamp
This revolutionary concept integrates a special UVC lamp to destroy green water and polish water to crystal clarity. The accessible ON/OFF switch allows for complete user control.
High capacity media storage
The new trend in canister filters is to increase the filter media-storing capacity to allow for larger amounts of chemical and biological media. This allows for high water quality due to more media contact through the initial pass. All filter baskets have convenient handles for removing and loading all types of media for easy customization.
Quiet, convenient canister filters are inconspicuously located under your aquarium. All the canister filters we offer are customizable, and can hold a large amount of media (mechanical, chemical, and biological) in varying combinations.
Whether you're setting up a larger aquarium or simply want to upgrade your existing filter, the versatile and reliable nature of a canister filter makes it a great choice. Use the following chart to determine which canister filter is right for you.
A canister filter is a sealed container filled with various filter media. The principle advantage of canister filters over power filters is their roomy media baskets which can be filled with a variety of filter media to create custom filtration.
Which aquarium filter is right for you? Today's aquarium fillters include undergravel filters, power filters, canister filters, wet/dry filters, and internal filters. Read more to make the smart aquarium filter choice.
Please note: Return of electrical equipment to Drs. Foster & Smith for exchange or refund is limited to 60 days from the date of purchase. Beyond 60 days, please contact the manufacturer for repair or replacement as covered by the manufacturer's warranty.
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