Green Grabber® surfaces
water changes. Remove
nuisance algae, nitrate and phosphate. Cultivate
seaweed for feeding.
DROP.6x unbox and install, by Mile High Reefers:
Similar DROP.6x installed on dirty freshwater tank:
Similar DROP.6x first cleaning on dirty freshwater tank:
Similar DROP1.4 installed on saltwater reef pond:
Comparison of all the DROP scrubbers:
DROP.6 dimensions: 3.25" wide x 5.5" tall x 2.75" thick
front-to-back (8 cm wide x 14 cm tall x 7 cm thick). It requires at least 5" (13 cm) of water to operate in.
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. Patent 9,115,008 and
9,708,207. All the oceans, reefs, lakes and rivers are naturally filtered only by algae, and all the
organic particles remain in the water to feed the creatures. Reduce your glass cleaning and water changes, and
create an environment for living micro-animals to grow inside the scrubber. No more dosing or possible
overdosing. No more refilling. No more pale corals from low nutrients, and no more sick animals from high
nutrients. Far more powerful than chaeto or refugiums, and does not remove the food particles. And you can use
the algae as food!
Get the no-overflow advantage of an upflow scrubber: since it is ALL underwater, it can't overflow onto your floor.
Finally an aquarium filter that offers drop-in installation in the smallest of spaces, along with reduction or
elimination of water changes and nuisance algae. And it's small enough to drop into the back compartment of many
all-in-one aquariums. It operates the way the oceans and lakes do, using algae to do all the filtering, and it truly
can replace all other filters in your aquarium if sized and operated correctly. The DROP.6 grows well in saltwater
with phosphate up to 0.2 ppm, and in freshwater with phosphate even higher.
Strong injection-molded case! This DROP.6 drop-in algae scrubber has 14 square inches (87 square cm) of extremely
rough Green Grabber ® one-sided algal growth surface which can grow up to 1/2" (1 cm) thick green hair
algae in saltwater (thinner in freshwater). This is designed to absorb the nutrients from this much feeding per
0.6 Frozen cubes, or
6 Pinches of flake, or
6 Square inches (36 square cm) of nori, or
0.06 dry ounce (1.8 grams) of pellets
The physical size or number of gallons or liters of water in your tank or sump does not matter; however the
amount of problem rock you might have, does. If you have rocks which are soaked with phosphate from having
been in a problem aquarium, each 10 pounds (4.5 kg) of this problem rock will add 0.2 cube a day to your
feeding amounts; so be sure to account for this when choosing a scrubber size or number of scrubbers. For
example if you feed 0.5 cube a day, but have 20 pounds of rock that came from a tank with nuisance algae
problems, this rock will add 0.4 cubes a day to your feeding. This applies even if the rock was dried out
and bleached, because this does not remove any nutrients from the rock.
If you feed more than the above amounts, you can get multiple DROP.6 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 DROP.6 units are also good for
The DROP.6 will fit into any size aquarium, underneath sumps, and many back compartments of all-in-one aquariums.
Nano and pico tanks, with sumps on the back side, normally have compartments at least 3" (15 cm) wide; and the
DROP.6 only need 3.5" width.. And of course it can fit into the display (the main part of the tank). Just keep it
suspended above the sand so that circulation can get into the filter. (Larger models such as the DROP1.2 and DROP1.4
have a special plate on the bottom which allows them to sit on sand).
The DROP.6 has water inlets and outlets at the bottom of the growth compartment, where internal upflowing air
bubbles inside the unit (from an air pump which you provide) flow up into the growth compartment and bring aquarium
water inside it. As the water enters the growth compartment, it mixes with the air bubbles, and rubs the
algae-attachment Green Grabber textures, and gets blasted by the super-red 660nm LED light. This rubbing of bubbles
causes algae to start growing on the rock hard (and heavy) Green Grabber textures; freshwater grows thin stringy
algae, and saltwater grows thicker, denser algae. The air then goes out of the top of the unit, and the water goes
down and out the bottom, without many air bubbles remaining. Positioning the DROP with 1/2 inch (1 cm) above your
waterline will eliminate all bubbles.
The Green Grabber algal growth attachment 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. Previous algae scrubber screens were made from "slippery" plastic canvas that is used for sewing and knitting;
algae take 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, allowing lots of light to reflect back to the algae. Light
= photosynthesis = filtering.
The main advantage of the DROP.6 or any algae scrubber is that if you size and operate it properly (based on
how much you feed), it can be the only filter for your tank, even replacing waterchanges. It can, however, also
be used with other filters. Some other filters such as carbon dosing (Zeo, pellets, etc) may slow down the
scrubber, but nothing will really "hurt" the scrubber except possibly large amounts of algaecide or copper
medications. The DROP.6 is also dry-out proof, since it's always under water. Power outages will not affect it.
And it can't overflow onto your floor.
The DROP.6 will run on both
120V and 240V, and comes with a 10 ft (300 cm) UL and CE approved power adapter cord with a U.S.
plug. If you require a different plug you can get an 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. It is a simple 2-wire plug,
which is also the same as a laptop power supply cord. The power cord is actually the same as a laptop computer
cord with a C7 connector (looks like a figure eight), so you can swap your laptop cord with your DROP if you
The DROP.6 uses a low voltage that is perfectly safe. The LED is sealed in a triple waterproofed manner;
this prevents corrosion from fresh and saltwater. The UL and CE approved power supply works on both 120 or
220 volts, it converts (and isolates) the 120 or 220 volt mains to the safe low voltage which is isolated
from the water, meaning that even if the LED were not sealed at all you could put the LED into the water and
it would continue to work and nothing would happen. It is recommended that you use a GFCI safely plug,
available at any aquarium, hardware, electrical or home improvement store, or online.
Comes with 3 ft (90 cm) of vinyl airline, but requires a small air
pump. Any small pump will work. It is the air bubbles which move water into the growth
compartment and up the growth surfaces, and also supply carbon dioxide (CO2 in the air) to the surfaces,
which allow algae to grow in the filter
The LED is a single red (660 nm) 3-watt LED, which is triple sealed
in epoxy. Some red light does come out of the bottom holes, and they make little red dots on the bottom of
the aquarium or sump (other DROP models have a special plate on the bottom which blocks most of this light).
You will need to get a timer so you can run the LED for up
to 22 hours per day (not 24). If you don't have a timer, you can start out without one until the growth
develops. The LED never needs replacing.
The DROP.6 will need to be cleaned ("harvested") every 7 to 14 days or when thick with growth. Just lift up
the DROP.6 out of the water, open the hinged lid, and pull the algae out (freshwater will usually require
taking the filter to your sink). You can even feed some of the algae to your fish, and there will probably
some some pods inside that you can feed too.
The DROP.6 comes with a 1 year warranty: 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 might require you to also pay an import charge when it
arrives, although the DROP.6 is low cost enough that many customs offices will not charge for it. We cannot
mark it as "gift", however. The lowest cost overseas shipping is generally USPS First Class Mail
International, however this option does not offer tracking outside the U.S. Therefore a better option is
USPS Priority Mail, which offers both tracking and insurance. The size of the shipping box 10" x 7" x 5" (25
cm x 18 cm x 15 cm).
DROP.6 size: 3.25" wide x 5.5" tall x 2.75" thick front-to-back (8
cm wide x 14 cm tall x 7 cm thick). It requires at least 5" (13 cm) of water to operate in.
No returns; please make sure this is the model you need.
Surfnsalt on the R2R site: