Legend Ar Mathor™ 500mL


Optimised bio-filter medium 100% natural & lightweight

High bulk density due to irregular shape (beads)

Very dense colonisation of bacteria

Longer intervals between cleaning

Better reduction of nitrite loads

Reusable (rinse carefully to clean)

Suitable for fresh and marine water




Legend Ar Mathor™

Legend Ar Mathor™ Biological filtration starts quickly after the initial setup. Mainly made of pumice stone with a porous surface, which is an ideal environment for beneficial bacteria to colonize. It also enables long, stable filtration. The irregular shape gives a high bulk density. Thus the whole of the volume in the filter (filter baskets or modules) can be utilized. Also, the optimum surface of the beads provides intensive colonization of the important purification bacteria.

Due to the high number of bacteria, peak nitrite loads are more easily reduced and the maintenance intervals of the filter material are longer.

A build-up of toxic nitrogenous wastes is a natural result of all aquarium inhabitant’s life processes. In nature, the body of water is large enough to dissipate or dilute these wastes. Some will even be converted into usable energy by living organisms. Within an aquarium, however, without a powerful biological breakdown of these toxins, the fish literally poison themselves. This is the reason why biological filtration is the most desirable of all aquarium filtration.

This type of filtration is the purification of aquarium water by using living organisms, such as nitrifying bacteria. These desirable bacteria will attach themselves to all hard surfaces within the aquarium system. They use the toxins as food, converting harmful toxins such as ammonia and nitrite into less harmful nitrate. Nitrate can then be removed by performing regular water changes. After prolonged use, mechanical and chemical filter media will act in a biological manner. They provide some surface area for bacterial colonization but this is actually very limited. In order to provide the greatest amount of surface area for bacteria colonies, filter media such as Legend Ar Mathor™ should be used.



Legend Ar Mathor™ allows nitrifying bacteria that break down fish waste and uneaten food to breed successfully in less time. So, the more you use, the more effective the water purification will be.

Each liter of Legend Ar Mathor provides as much surface (>~700 m2).


Use 250 mL of Legend Ar Mathor™ for each 200 L (50 US gallons)** of water. Legend Ar Mathor™ may be placed in any kind of filter and is particularly effective in a canister filter. Legend Ar Mathor™ is sufficiently large that no filter bag should be required for most applications.


Additional information

Weight 1 kg


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