Dymax Slim Flo SF-500, HOB Filter, Large
SKU: DM-SF500
MSRP: $ 32.99
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Available Through Authorized Retailer
- The Dymax Slim Flo SF-500 is a hang-on-back filter built for freshwater planted tanks up to 24 gallons.
- It is designed for 10- to 24-gallon planted tanks and community tanks where a canister filter is too much.
- It moves up to 125 GPH through a wool carbon cartridge, turning over the tank volume multiple times daily.
- It packs 125 GPH into a slim hang-on body, so there is no need for a canister filter or sump plumbing.
Dymax
Dymax is a Singapore-based aquatic brand with over 23 years of expertise in designing and manufacturing aquariums, filters, aquatic foods, and other fishkeeping products.
Hang-On-Back Filter for Planted Tanks 10 to 24 Gallons
The Dymax Slim Flo SF-500 Filter is a hang-on-back filter rated for freshwater aquariums from 10 to 24 gallons. It delivers up to 125 GPH through a wool carbon cartridge that handles mechanical filtration and basic chemical polishing in a single pass. For hobbyists running a mid-size planted tank or community setup who want dependable filtration without the cost, footprint, or plumbing of a canister filter, the SF-500 covers the range cleanly.
At 125 GPH, the SF-500 turns over a 24-gallon tank more than five times per hour at full output. The adjustable flow dial brings that down for tanks with plants requiring lower surface agitation or community fish that prefer calmer water. The intake sponge protects small fish and shrimp from being pulled into the unit, and the leveling knob handles rims that are not perfectly level.
Key Features:
- Hang-on-back design requires no drilling, no plumbing, and no sump, fitting tanks with standard rimmed or rimless construction
- 125 GPH max flow rate handles tanks up to 24 gallons with multiple daily turnovers
- Adjustable flow dial scales output down for planted tanks with CO2 injection or sensitive community fish
- Wool carbon cartridge provides mechanical and chemical filtration in one replaceable unit
- Quiet motor operation suitable for living room and office setups
- Intake sponge prevents small fish, shrimp, and fry from entering the intake
- Leveling knob ensures a stable hang on rims that are not perfectly flat
- Replacement cartridges are sold separately as a 2-pack (DM-SFC-L)
Ideal For:
- 10- to 24-gallon planted tanks and community tanks that need consistent mechanical and chemical filtration without a canister filter
- Hobbyists stepping up from a smaller tank who want more flow capacity without committing to a canister or sump setup
- Breeders and grow-out tank keepers who want a simple, reliable HOB filter that is fast to clean and easy to maintain
Pro Tips:
- Run the SF-500 alongside CO2 with the flow set lower, not higher. High surface agitation from a filter at full output drives off CO2 faster than your system can inject it. Dial the flow back until you see gentle ripple rather than turbulent surface movement, and your CO2 efficiency will improve noticeably.
- Add a pre-filter sponge to the intake if you are breeding fish or keeping fry. The included intake sponge protects most small stock, but a dedicated pre-filter sponge adds another layer of protection and extends cartridge life by catching larger particles before they reach the media.
- Replace the cartridge on a schedule, not when flow slows. By the time the SF-500 shows a visible flow drop, the cartridge has already been undersized for your tank load for at least a week. Set a recurring reminder to swap it every three to four weeks regardless of how clear the water looks.
What's Included:
- Dymax Slim Flo SF-500 filter unit
- Intake tube
- Intake sponge
- Leveling knob
- Filter media (wool carbon cartridge)
- Power cord
Specifications:
- SKU: DM-SF500
- Tank Size Rating: 10–24 gallons
- Max Flow Rate: 125 GPH
- Flow: Adjustable
- Filter Media: Wool carbon cartridge
- Replacement Cartridge SKU: DM-SFC-L (sold separately)
Warranty
CoralVue, Inc. hereby guarantees this product to be free from defects in material and workmanship for a period of:
- 1 Year
Warranty is activated on the date of purchase.
This Standard Limited Warranty applies and is limited as follows:
- To the product only as long as it remains in the possession of the original purchaser.
- To the product that has not been subject to accident, misuse or abuse.
- To the product that has not been modified, altered, defaced, or had repairs made or attempted by other than CoralVue, Inc.
- That CoralVue be immediately notified in writing within ten (10) days of first knowledge of defect by owner or his agent.
- That CoralVue, Inc. shall be given first opportunity to make any repairs, replacements or corrections to the defective construction within a reasonable period of time.
- Under no circumstances shall CoralVue and/or the Manufacturer be liable by virtue of this warranty or otherwise for damage to any person or property whatsoever for any special, indirect, secondary or consequential damages of any nature however arising out of the use or inability to use because of the product defect.
Instructions:
- Attach the intake sponge to the bottom of the intake tube.
- Hang the filter unit on the tank rim and use the leveling knob to achieve an even, stable fit.
- Fill the filter body with tank water before plugging in to prime the pump and prevent dry-start noise.
- Insert the wool carbon cartridge into the filter chamber.
- Plug into a standard outlet and set the flow dial to the lowest setting.
- Gradually increase flow as needed for your tank inhabitants.
- Replace the wool carbon cartridge every 3 to 4 weeks, or sooner if the flow noticeably drops.
Note: Do not run the filter dry. Always ensure the intake tube reaches below the waterline before powering on.