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Santa Monica Filtration HOG3 Hang-On-Glass Algae Scrubber


Starting at $28/mo with . Learn more

Item #: 6Y90739

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Santa Monica Filtration HOG3 Hang-On-Glass Algae Scrubber

The HOG3 is a hang-on-glass algae scrubbing filtration system that can be used to reduce your glass cleaning and water changes while creating an environment for living micro-animals to grow inside the scrubber. Compared to the HOG.5, HOG1, and HOG1x scrubbers, the HOG3 offers much larger algae-attachment space to hold more growth between cleanings, as well as a 2-sided algal growth surface texture and stronger magnets to attach to thicker aquarium walls up to 5/8" (16mm).

The HOG3 is ideal for tanks which have nutrient or algae problems, aquariums that are showing signs of old tank syndrome, or in highly-fed predator or NPS corals tanks. It is designed for stronger photosynthesis with 6 LED lights and will need to be cleaned every 7 to 21 days.

  • Utilizes a rough & light-reflecting Green Grabber algal growth attachment surface, along with double sided strings, which accelerates algae growth
  • Upflow scrubber technology prevents overflow risk-- since it is ALL underwater, it can`t overflow onto your floor
  • Has 36 square inches (225 square cm) of two-sided algal growth surface textures and strings
  • No electrical parts go inside the aquarium
  • Air bubbler supplied-- no air stone required
  • Will run on both 120V and 240V
  • Power supply comes with a 10 ft (300 cm) UL and CE approved power adapter cord with a simple 2-wire U.S. plug, which can easily be modified
  • Can be used as a stand-alone filter or in conjunction with most other filters
  • Dry-Out proof: Power outages will not affect it since it`s always under water
  • Harvested algae can be used to feed your fish, if desired
  • Includes a 1 year warranty for replacement or repair
  • Includes 3 ft (90 cm) of vinyl airline, but requires an air pump that can pump at least 2.0 liters per minute (.07 cfm), preferably more
  • Needs to be cleaned ("harvested") every 7 to 21 days or when thick with growth
  • Magnets attach the outside cover to the inside cover through the aquarium wall, and can be used on glass or acrylic 1/4 inch (6 mm) to 5/8 inch (16 mm).
  • Magnets are protected by a hard plastic cover inside black silicone, preventing rust or scrapes
  • Not recommended for tanks with thin 1/8" (3mm) glass, as the strong magnets may crack the glass

  • Includes six red (660 nm) 3-watt LEDs, which are attached to a heat sink inside the cover. *The cover does get warm
  • Lights are powerful enough to grow green algae, as opposed to the brown algae grown by the lower power lights of the HOG1.3 or HOG2.
  • The LEDs will give the aquarium or sump a slight red color at night when the aquarium lights are off
  • The LEDs never need replacing
  • A timer is required to run the LEDs for up to 22 hours per day

  • Dimensions: 6 5/8" wide x 8 3/4" high x 1 1/2" thick (16.6cm wide x 21.9cm high x 3.75cm thick)
  • Recommended Water Level: 7" (17.5cm) of water to operate in
  • LEDs: 6 red (660 nm) 3-watt LEDs, which are attached to a heat sink inside the cover
  • Requires an air pump that can pump at least 2.0 liters per minute (.07 cfm), which medium-cost air pumps can usually handle. Pumps that say they can handle 2 or more airstones/outlets, or pumps with 2 tubing attachments instead of one, will usually be needed. You can have as much air as you like, however; 10 lpm pumps are no problem.

1 - 5 Gallons 5 - 10 Gallons 10 - 40 Gallons 55 - 120 Gallons 180 - 300 Gallons 450+ Gallons
RAIN2 x2 x3 x5
DROP.2 x2
Saltwater only
HOG.5 x2
x2 x4
HOG1.3 x2 x4
HOG2 x2 x3 x5
Saltwater only
x2 x3 x4
Saltwater only
x2 x3 x5
Saltwater only
x2 x4
Saltwater only

5 Stars


Reviewed on
October 23, 2020

Good to help lower phosphates and nitrates

Was easy to setup. Took a few weeks to get it to where it was stable. You have to do a very controlled grow of the hair algae and clean just enough to get it to grow and even out properly. Once established it really does a great job. I also run a macro reactor on a different tank and this is on par but much easier to clean.

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