Cleans the substrate with no mains cable near the water.
No siphon to prime, no bucket on the floor and no mains cable anywhere near the tank. It lifts waste out of the substrate without removing much water at all.
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Why you'll love it
Most powered gravel cleaners are 110 V units built for another market. Running on batteries removes the voltage question completely, and there is no cable to trail into water.
For a routine substrate clean it pulls waste into the filter bag and puts the water back, so the level barely moves. Fit the siphon hose only when you actually want a water change.
Two interchangeable extension tubes cover water lines from 34 to 60 cm. Below about 40 cm it will not prime properly, which the supplier states and we would rather you knew first.
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A traditional gravel vacuum does two jobs at once: it lifts waste out of the substrate and it removes water, which is the actual water change. This does the first without the second, filtering the water and returning it to the tank rather than to a bucket.
That makes it a complement rather than a substitute. You still need to change water regularly, because the point of a water change is exporting nitrate, and nitrate is dissolved in the water rather than sitting in the gravel. What this covers is the mess that accumulates between changes.
Nano tanks are the clearest case. Removing twenty percent of a twenty litre tank is four litres, and a standard siphon takes that in seconds, which makes controlled cleaning difficult. A battery unit lets you work the substrate carefully without watching the water level drop.
It is also the practical answer for a tank that is awkward to siphon: high on a shelf, a long way from a sink, or in a room where a bucket and a wet hose are not welcome. Being cordless removes the extension lead running to a socket near water, which is worth something on its own.
Gravel and coarse sand work well: waste is lighter than the substrate, so it lifts into the intake while the gravel stays put. Very fine sand does not, because it is light enough to be drawn up alongside the waste and you end up losing substrate into the filter chamber.
On fine sand the better approach is to hover just above the surface rather than pushing into it, which lifts the detritus sitting on top without disturbing the bed underneath. Work over a third of the tank at a time rather than the whole floor, which keeps disruption down and still covers everything within the month.
In the box
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The details
Empty and rinse the collection chamber immediately. Waste left sitting in a sealed chamber decomposes and produces a genuinely unpleasant smell within a day, and the residue is difficult to shift once it has dried on.
Dry the unit thoroughly before storing, particularly around the battery compartment seal, and take the batteries out if it is going to sit unused for weeks. A leaking cell in a stored unit ruins the contacts, and that is the usual reason one of these fails rather than the motor.
Loved by real pet parents
This was the whole reason I chose it. Two C cells and there is nothing to trail a plug down into the tank, which I was never comfortable with. It shifts a surprising amount of debris for a battery unit and the water was clear again within the hour.
The C cells are not included and I did not read carefully, so it sat on the side for two days until I got some. Once running, the filter and return mode does the substrate without dropping the water level, which is what I wanted. Mine does get through batteries faster than I expected with weekly use.
Routine gravel cleans used to mean two buckets and a wet floor. The bonnet catches the debris and puts the water straight back, so the level barely moves and I only do a proper change monthly. Emptying the filter bag afterwards is the only messy bit and it takes a minute.
Ours sits at 55cm at the water line and the body extends from 56 up to 80cm, so there is plenty of adjustment and my hands stay dry. The two extension tubes in the box cover the shallower tank in my son's room as well.
I usually stir up a fog when I clean the gravel by hand and it takes a day to settle. With this the tank was hazy for about twenty minutes and clear by the evening, because the debris goes into the bag rather than back into the water.
It is not loud exactly, but there is a definite buzz from the motor that you can hear across the room and our cat left. Performance is good, it clears the front half of a four foot tank in ten minutes. Just do not expect it to be silent.
Ours sits at about 35cm at the water line and it struggled to get going, which the description does warn about below 40cm. In our bigger tank it works properly, so this is on me for not measuring first. Useful to know if you have a shallow setup.
The hose clips on in a second and then it drains straight to a bucket instead of returning, so the one unit does both the weekly tidy and the monthly change. I keep the hose coiled in the cabinet with the spare tubes and the manual.
Two hundred and twenty grams means I can work the substrate slowly with one hand and steady the extension with the other. The suction cup attachment parks it against the glass while I move things about, which I did not expect to use and now do every time.
Good questions
No. It takes two C cells, which are the fat round ones rather than the AA you have in a drawer, so it is worth ordering a pair at the same time.
It needs a water line of at least 34 cm and works properly from about 40 cm. In a shallow nano tank it will draw air instead of water; use the hand siphon bulb there.
Yes, but hover rather than plunge. On fine sand hold the head just above the surface so it lifts the waste and leaves the sand behind.
No. It lifts waste from the substrate and returns the water to the tank. Water changes export nitrate, which is dissolved in the water, so you still need to do them.
Poorly. Fine sand is light enough to be drawn up with the waste. Hover just above the surface rather than digging in, or use a siphon on very fine substrate.
As often as the tank needs, which for a heavily stocked setup might be twice a week. Work over a section at a time rather than the whole floor in one go.
Last reviewed 30 August 2026
Advice
25 percent weekly covers most tanks. What matters is why: nitrate accumulates, and nothing in a normal filter removes it.
7 min read