6 Best Algae Magnets For Keeping Sensors Visible For Divers

Maintaining clear visibility on underwater sensors is essential for both data accuracy and successful photography while diving. Algae buildup can obscure lenses in a matter of hours, turning a productive session into a frustrating exercise in guesswork. Selecting the right magnetic cleaner ensures that gear stays pristine without requiring constant manual intervention or risking delicate equipment surfaces.

Disclosure: As an Amazon Associate, this site earns from qualifying purchases. Thank you!

Flipper DeepSee MAX: Best for Large Viewports

When dealing with large-diameter domes or flat viewports on sophisticated underwater sensors, the Flipper DeepSee MAX stands out as the premier choice. Its massive surface area allows for efficient clearing of algae without needing to make dozens of passes over the same spot. This efficiency is critical when working in current-heavy environments where time is a luxury.

The strength of the magnets within this model is exceptionally high, ensuring it stays firmly attached even when moving across curved glass surfaces. Because it features a dedicated, soft scrubbing pad on the internal side, the risk of micro-scratches on expensive optical glass is significantly reduced. This is a robust investment for those who prioritize equipment longevity over initial cost.

If high-end imaging gear or long-term stationary sensor arrays are on the menu, this is the definitive recommendation. It provides the stability and surface coverage necessary to keep expensive optics crystal clear throughout a dive.

Mag-Float Scraper: Top Budget-Friendly Choice

For divers who need a reliable, no-nonsense solution without the high price tag of specialized photography gear, the Mag-Float Scraper is the go-to standard. It is lightweight, intuitive, and does exactly what is expected: it keeps viewing windows clear through simple magnetic attraction. The design is straightforward, making it an excellent starter tool for those maintaining underwater equipment on a consistent basis.

The primary benefit of this model is its buoyancy; if the inner magnet accidentally separates from the outer one, it floats directly to the surface. This feature alone prevents the common nightmare of losing expensive cleaning gear to the murky bottom of a lake or harbor. While it may not have the heavy-duty specialized scrapers found on pricier models, it handles standard film buildup with ease.

Choose this tool if the goal is a balance of affordability and utility. It is an ideal addition to any basic dive kit that does not require heavy-duty debris removal.

Tunze Care Magnet Pico: For Small, Tricky Areas

Precision is the hallmark of the Tunze Care Magnet Pico, designed specifically for tight corners and small-diameter sensor housings. Traditional, bulky magnets often fail to reach the edges where algae tends to accumulate most aggressively. This unit utilizes thin, high-performance plastic blades that cut through tough buildup that standard felt pads might slide right over.

The slim profile of this magnet allows it to navigate around protrusions and housing bolts that would knock other cleaners off their track. Because it is so compact, it offers the highest level of control, allowing for detailed cleaning around buttons, wires, and narrow sensor apertures. It is an indispensable tool for technical divers who utilize custom-fabricated sensor housings.

Do not overlook this model if the equipment features a complex geometry that larger magnets cannot navigate. It is the most surgical option on the list, making it the perfect partner for specialized underwater instrumentation.

Aqueon Algae Cleaning Magnet: A Reliable Classic

The Aqueon Algae Cleaning Magnet is a time-tested workhorse that has earned its place in countless gear bags. It relies on a proven design that prioritizes consistent magnetic force and high-traction cleaning surfaces. There are no gimmicks here—just a sturdy, dependable tool that provides enough grip to tackle stubborn green algae without hesitation.

One of the greatest strengths of this magnet is its ergonomic exterior grip, which makes maneuvering across a housing feel natural and comfortable. Divers appreciate the lack of slipping, even when wearing gloves in colder water conditions. It is a predictable, steady performer that rarely requires adjustment or troubleshooting during a dive.

This is the right choice for the diver who prefers reliability over novelty. It is a “set it and forget it” tool that performs reliably across a wide range of standard water conditions.

Two Little Fishies NanoMag: Great for GoPro Domes

The NanoMag by Two Little Fishies is exceptionally well-suited for the specific demands of GoPro domes and smaller action-camera lenses. Its compact size ensures it does not block the sensor’s field of view if a quick clean is needed mid-dive. The magnet is surprisingly strong for its size, maintaining a solid connection through surprisingly thick acrylic domes.

Beyond its cleaning capabilities, it is remarkably discreet. Divers often leave it attached to a corner of the housing, allowing for a quick swipe across the lens whenever a momentary accumulation of silt or algae occurs. This keeps the camera ready for action at a moment’s notice, which is vital when capturing fleeting wildlife encounters.

For those who lean heavily on compact action cameras for underwater documentation, this magnet is the industry standard. Its small footprint and high-traction cleaning surface make it a perfect fit for a mobile dive setup.

Gulfstream Tropical Mag-Clip: Most Versatile Option

The Gulfstream Tropical Mag-Clip is designed for those who need a tool that can adapt to different gear configurations. Its design allows it to work effectively on varying thicknesses of glass and plastic, meaning it can be moved between a primary camera housing and a secondary environmental sensor. This level of versatility is rare and highly prized by professionals who rotate their equipment frequently.

The magnet’s profile is neither too thick nor too thin, striking an ideal balance between reaching difficult spots and maintaining a powerful grip. It is engineered with materials that resist corrosion, a vital consideration for those moving between freshwater and saltwater environments. This durability ensures that the magnetic strength remains consistent even after extended exposure to harsh mineral deposits.

If the gear bag contains multiple devices with varying housing materials, this is the most logical investment. It is the “Swiss Army knife” of algae magnets, offering consistent performance regardless of the specific sensor being maintained.

Choosing the Right Magnet for Your Dive Gear

When selecting an algae magnet, the thickness and material of the viewport are the most critical factors. A magnet that is too weak will lose contact at the slightest movement, while one that is too powerful can become difficult to maneuver or even scratch the housing. Always verify the manufacturer’s rating for the thickness of the acrylic or glass being cleaned to avoid these common pitfalls.

Consider the environment in which the gear is used as well. In fast-moving water or high-surf zones, a stronger magnetic pull is necessary to ensure the cleaner doesn’t drift away. Conversely, in calm water, a lower-profile magnet provides better maneuverability around complex housing shapes and buttons.

• Check compatibility: Ensure the magnet is safe for the specific material of your lens (glass vs. acrylic).
• Assess weight: A lighter magnet is easier to pack but may struggle in high-current conditions.
• Evaluate ergonomics: Ensure the outer grip is easy to hold, even with neoprene gloves.

How to Use an Algae Magnet Without Losing It

The most common error when using an algae magnet is allowing the internal piece to drop, potentially damaging the sensor or being lost entirely. To mitigate this, many divers attach a small tether, such as a thin piece of high-visibility fishing line, to the internal magnet. This creates a safety loop that allows for easy retrieval if the magnetic bond is accidentally broken.

Another effective technique involves working slowly and deliberately. Rapid, sweeping motions are more likely to cause the magnet to skip or detach, especially on curved surfaces. By maintaining steady pressure and moving in controlled, circular patterns, the magnet stays locked in place while effectively loosening stubborn organic growth.

Always keep the cleaning surfaces free of sand. Even a single grain of grit trapped between the magnet and the sensor housing can lead to deep, permanent scratches. Inspect the cleaning pads after every use to ensure they are free of debris before stowing them away.

Saltwater Care: Keeping Your Magnet Like New

Saltwater is notoriously hard on magnetic gear, as salt crystals can build up and compromise the seal of the internal housing. After every dive in marine environments, thoroughly rinse the magnet in fresh, clean water. Drying it completely before storage prevents the accumulation of mineral deposits that can diminish the magnet’s grip over time.

Inspect the magnets periodically for signs of oxidation or rust, especially if the outer casing has sustained any scratches. If the plastic housing of the magnet shows signs of cracking, it is time to replace it immediately. A compromised magnet can release contaminants into the water or fail to maintain a secure grip, both of which jeopardize the integrity of the underwater sensors.

Consistency in maintenance is the difference between a tool that lasts a season and one that lasts a decade. By dedicating a few minutes to proper cleaning after each trip, you ensure that the equipment remains as effective as the day it was purchased.

FAQ: Algae Magnets for Underwater Sensors

Can algae magnets scratch my sensor housing? Yes, if grit or sand particles become embedded in the scrubbing pad. Always inspect the pad before use and avoid dragging the magnet through sandy substrate at the bottom of the water column.

Do I need a different magnet for glass versus acrylic? It is highly recommended to choose a magnet that matches the material of your viewport. Some magnets use aggressive pads that are safe for glass but can cause micro-scratches on softer acrylic surfaces.

How often should I clean the magnet itself? After every dive. Rinsing away salt, silt, and organic matter prevents the growth of bacteria and the buildup of mineral deposits that can weaken the magnet’s performance.

What should I do if my magnet loses its grip? If the magnet is consistently sliding, it may be undersized for the thickness of your housing or the strength of the current. Verify the specifications of your housing and consider upgrading to a model with a higher magnetic pull-force.

Proper maintenance of sensor optics is a fundamental aspect of responsible underwater recreation. By choosing the right tool and adhering to a consistent cleaning regimen, you ensure your equipment remains in peak condition for every outing. Invest in quality gear that matches your specific diving environment to maximize clarity and safeguard your technology for the long haul.