Hang On Glass®
nuisance algae, nitrate and phosphate
algae for free feeding
UAS for freshwater,
stronger light for nitrate over 50 ppm
(6mm) to 5/8" (16mm)
acrylic or glass
From New to Green in 3 cleanings, of the similar HOG1.3:
Fish eating from a HOG2:
Similar HOG2 gets unboxed by Reef Review in Australia:
Unboxing and Installation of the similar HOG1.3
Comparison of similar HOG2 to the HOG1.3 and HOG3:
Similar HOG2 on Cichlid tank:
HOG2x dimensions: Each cover is 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).
Operates on both 120 and 240V. Can be shipped to any
country; you can find shipping costs by putting the item into the
shopping cart; be sure to click "display rates"
No dangerous metal 240/120 volt lights.
Welcome to algae scrubbers. We are the only source for patented upflow scrubbers: U.S. Patents 9,115,008 and
9,708,207.and 9,408,374 as well as Chinese CN203392929U. All the oceans, reefs, lakes and rivers are naturally
filtered only by algae, and all the organic particles remain in the water to feed your creatures. Reduce your
nitrate, glass cleaning and water changes, and create an environment for living micro-animals to grow inside the
scrubber. No more dosing or possible overdosing of chemicals. No more refilling media. And you can use the algae
as free food for your herbivores!
Get the no-overflow advantage of an upflow scrubber: since it is ALL underwater, it can't overflow onto your
floor. Just nice soothing bubbling, like you probably already have in your freshwater tank. And since there are
no strings (like our HOG3), it's easier to brush the freshwater growth clean in your sink
This HOG2x scrubber has 48 square inches (300 square cm) of one-sided freshwater algal growth surface, which once
growing is designed to absorb the nutrients from this much feeding per day:
2 Frozen cubes, or
20 Pinches of flake, or
20 Square inches (125 square cm) of nori, or
5.6 grams of pellets
The number of gallons or liters of water in your tank or sump does not matter. If you feed more than the
above amounts you can get multiple HOG2x units; multiple units are preferred over one larger unit because
you can clean one unit per week, and because you'll always have one unit filtering while the other one
starts growing again after a cleaning. Multiple units are also good for backup. The magnets attach the
outside cover to the inside cover through the aquarium or sump glass, and can be used on glass or
acrylic 1/4 inch (6 mm) to 5/8 inch (16 mm). Not more. If your
aquarium wall is 3/4" (18mm) it might work but you won't know until you try; it would be better to put the
HOG2x in your sump instead; it will work the same.
Compared to the HOG2 which looks the same, the HOG2x has Xtra light LED lamps, and is meant for freshwater
tanks with nitrate over 50 ppm. It will still work with saltwater, but the thicker growth you get in
saltwater is better with the strings on the HOG3. The HOG2x has the exact same 6 LED lamps as the HOG3, but
with the freshwater Green Grabber growth surface of the HOG2. So this HOG2x is optimized for freshwater
The Green-Grabber® algal growth surface is so rough and prickly that it might be the roughest thing
you've ever felt. A cactus might be sharper, but that's about it. Rough surfaces are critical for allowing
algae to attach and grow and thus provide strong absorption of nutrients. The rock-hard protrusions stick
straight out 1 to 3 mm. Old style algae scrubber screens are made from "slippery" plastic canvas that is
used for sewing and knitting; algae takes a long time to attach to it. Green-Grabber® growth surfaces
are not plastic at all; instead they are rock hard and have jagged rough edges and points (don't let
children play with them). And the white color of the Green-Grabber surface reflects as much light as
possible, getting almost the effectiveness of a 2-sided growth surface even though it really only has a
light on one side of the surface.
This is a hand-built Hang-On-Glass® (HOG) Upflow Algae Scrubber® (UAS) with a Green-Grabber
growth surface, for glass or acrylic 1/4 inch (6 mm) to 5/8 inch (16 mm)
thick. This is the typical
thickness range for most aquariums, and larger sumps, however you should measure yours to be sure. If your tank
uses thin 1/8" (3mm) glass such as many low-cost 10 gallon aquariums do, this filter is not recommended because
the magnets are strong enough that they might crack the glass. You would be better off getting a lower cost
HOG.5 or HOG1 filter HERE
No electrical parts go inside the aquarium; only air. And the air bubbler is already supplied (it's sealed
behind the growth surface), so you don't have to get an airstone. The bubbler is simply vinyl air hose that has
been cut lengthwise, and with cross-cuts, to form little flexible segments that are both adjustable and
open-able to allow for easy cleaning. This HOG2x will run
on both 120V and 240V, and comes with a 10 ft (300 cm)
power cord with a U.S. plug. If you require a different plug you can get a plug adapter at any local hardware or
travel store, or online, or you can cut off the U.S. plug and install your own plug from a hardware store. Or
just use a figure-8 laptop power cord; it plugs right in, no transformer needed.
Comes with 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. A pump that
says it can handle 2 or more airstones/outlets, or a pump with 2 tubing attachments instead of one, will be
needed. You can have as much air as you like, however; 10 lpm pumps are no problem (although it will be
louder). One powerful pump which works exceptionally well is the Whisper AP 300 from Tetra. You will
need to combine the two outputs into one to feed the scrubber, using something such as the "Tee" or "Y" air
line tubing fitting from Tom Aquatics. Make sure to put the air pump above the aquarium so that it will not
drain any water if it shuts off, or use a one-way valve on the airline if the pump is lower.
Comes with 6 red (660 nm) 3-watt LED lamps, which are attached to a heat sink inside the cover. The LEDs
will give the aquarium or sump a slight red color at night when the aquarium lights are off, which is why
some people put it in a sump. You might need to get a timer so you can run the LEDs for less than 22 hours
per day, but you can try 24 hours (no timer) first and see how it goes. The LEDs never needs
The HOG2x growth surface will need to be cleaned every 5 to 14 days, by removing the inside cover,
disconnecting the airline, and taking the inside cover to the sink so you can brush the algae off of the
growth surface and the bubbler with a toothbrush. No hard scraping is needed; just brush it with a
toothbrush or larger brush. The Green-Grabber growth surface is permanently glued to the inside cover using
epoxy, however a few of the Green-Grabber particles may dislodge during the first few cleanings, which is
normal. Cleaning the growth surface, bubbler, and the inside cover takes about a minute with a toothbrush
once you are at your sink.
This HOG2x comes with a 1 year warranty for the original purchaser. Warranty is for replacement
or repair only; not a refund. Costs for shipping back to us are not covered; you will need to ship the
entire unit back to us before we can ship a replacement. Warranty is limited to repair or replacement, and
does not cover fish loss, personal injury, property loss, or direct, incidental or consequential damage
arising from the use of it. The warranty and remedies set forth above are exclusive and in lieu of all
others, whether oral or written, express or implied. We specifically disclaim any and all implied
warranties, including but not limited to lost profits, downtime, goodwill, damage to or replacement of other
equipment and property, and any costs of recovering animals, plants, tanks or other aquarium related items
and/or equipment. We are not responsible for special, incidental, or consequential damages resulting from
any breach of warranty, or replacement of equipment or property, or any costs of recovering or reproducing
any equipment, animals or plants used or grown with this product.
Can be shipped to any country; you can find shipping costs by using
the shopping cart; be sure to click "display rates". If you don't have a zip code, enter "zip code"
instead. Note that shipping outside of the USA will probably require you to also pay an import customs
charge when it arrives. We cannot mark it as "gift". The lowest cost (but slowest) foreign shipping is
generally USPS First Class Package International, but USPS Priority Mail International is better because it
is faster and has insurance. The size of the shipping box is 10 x 7 x 5 inches (25 x 17.5 x 10 cm).
HOG2x size: Each cover is 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). It requires at least 7" (17.5cm) of water to operate in.
Comments of similar HOG2:
"Excellent super quick delivery will buy from again" -- bjbearr on ebay
"HOG2 and HOG1.3 are both producing a beautiful thick dark green algae that I harvest each week, dry out,
and feed to the plecos (but the other fish nibble it too)" -- Ben Ochart.
"I have two HOG2 scrubbers in my freshwater tanks" -- FK Leyro
"It's growing thick mats of green [freshwater] algae on it now" - Sean Wojtowicz - Loxley, Alabama, USA
"Very nicely made. easy to install and get working" -- Kevin Eklund, USA
"Thanks for the clear instructions you taped to everything! Between them and the video I watched,
installation [of the HOG2] was a breeze" -- Nancy of Goldfish-Emergency
"Getting lots of thick green algae to clean. My ornamental goldfish love to eat it. Have 4 of the HOG2’s in
the sump for my 350 gallon freshwater tank. Anyway the HOG2s appear to be working great as far as growing
the thick green algae" -- Doug Jackson
"Well I can report that things have gone from good to excellent. Since my HOG2 was installed, ive used 3
different test kit brands, all of which have shown Zero on nitrite, nitrate, phosphate & ammonia (once
the level came down). My goal of having ONLY the hog2 as filtration is now achieved other than a poly filter
in the sump. It feels like im not reading it right or something is going on I dont see. After years of
keeping fish and havinv the usual problems, its all perfect now. Absolutely fantastic! Test readings are
s.g. 1.025. Ph fluctuating around 8.0 - 8.4. Phosphate, ammonia nitrite & nitrate zero. I feed some of
the scrubbers algae on a veggi clip to the yellow tang. Hope you folks get the same results as ive got using
the santamonica scrubber. All that i can only guess is all down to the HOG2 as its the only thing ive used
differently from before and had nowhere near the success im having now. Most if not all corals have doubled
or quadrupled in the last few months" -- Centralscot on the scrubber site.
"A+ Thanks [HOG2]" -- steve_flynn on ebay.
"just installed [HOG2], seems to be running smoothly, exciting about the result" -- dandanstr on ebay.
"A+++ [HOG2]" -- bdavis302012 on ebay.
"Great eBayer [HOG2]" -- nwhitwell on ebay.
"HOG2 seems to work great! Thanks again! My clown loaches love the water now" -- Antti Miettinen, Finland.
"I just wanted to let you know my nitrate levels are zero. I have never had this tank at zero nitrates. I
have always had to do multiple water changes ever week. Can’t thank you enough. Neither can my fish." --
Snohomish, Washington, USA