Absorbents
Ammonium, nitrate, phosphate and silicate removers, activated carbon and ceramic granules for filters.
How to choose?
from€7.99
Unit price: €67.71 / l
€12.99
Unit price: €76.41 / kg
Advice and care
How to choose filter adsorbers
An adsorber solves a specific problem, so choose it by what the test or the water shows.
Activated carbon
Use carbon after a treatment to remove medicine residues, colour and odour.
Nitrate and phosphate
Removers help when water changes are not enough and algae take over.
Saturation
An adsorber saturates, so replace it when the maker advises.
Popular brands
All brandsFrequently asked questions
Should activated carbon stay in the filter all the time?
No, it is mostly used for a while, such as after treatment. If used constantly, it must be replaced regularly.
Can I use a phosphate remover in a planted tank?
Only briefly, because plants need nitrate and phosphate as nutrients. For a lasting problem, look for the cause in the balance of light and fertiliser.
Read more
Absorbers are filter media that bind specific substances from the water: ammonium, nitrate, phosphate, silicate or organic compounds. They do not replace water changes or biological filtration but help when the level of a particular substance is too high.
Place the absorber after the mechanical stage in the filter so that larger particles are already removed by the time water reaches it – that way it does not clog with dirt and lasts longer. Use a filter bag for loose granules so they do not get into the impeller. Ceramic granules do not bind substances but give filter bacteria a surface to live on, so they do not need regular replacing; rinsing in aquarium water is enough.
Before using a phosphate or nitrate remover, measure the levels with a test and keep measuring afterwards, because too sharp a drop can slow plant growth.