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SILI-OUT 2 Silicate Remover

  • Removes safely, fast and permanently:
    • Silicate
    • Phosphate
    • Barium
    • Arsenic
    • Chrome
    • Dyeing substances
  • Aluminum based formulation with a purity above 99%
  • Enhances the natural growth of plants and corals
  • Prevents the growth of diatomes

Saltwater & Freshwater
Controlled decrease
Removes waste materials
Clean water

Sili-Out 2 removes silicate, phosphate, barium, arsenic, chromium, as well as dyes and turbidities from water quickly, reliably and permanently and improves the water quality for the long term.

Sili-Out 2 specifically reduces the above-mentioned pollutants in a way that is harmless for your animals and without affecting the pH value.

Sili-Out 2 improves the natural growth of corals and plants in polluted areas within a very short time. The growth of undesirable diatoms is sustainably prevented.


  • Silicate
  • Phosphate
  • Barium
  • Arsenic
  • Chromium 
  • Coloured dissolved organic matter

Dosage incl. dosage calculator

Your aquarium
(net volume of water in litres)

Saltwater and freshwater aquarium: 40 g per 100 L of water


Dosage in saltwater and freshwater aquariums:
Use 50 ml (40 g) per 100 litres of water.

Always start with the recommended quantity of Sili-Out 2 and increase it by up to 100 ml (80 g) for 100 litres of water, if necessary.

Before application, thoroughly rinse Sili-Out 2 under water to remove dust.

FAQ Questions and answers

Since Sili-Out 2 absorbs phosphate, barium, arsenic, chromium and yellow substances from the water in the aquarium in addition to silicate, no general statement can be made here as to the time after which the granules should be replaced. Here it is important to measure the substances to be absorbed and if the value does not fall further or rises again, the Sili-Out 2 should be changed. Depending on how much of the individual substances is present in the aquarium, this time varies from aquarium to aquarium.

Tips & Tricks
  • We recommend using Sili-Out 2 in a fluidized bed filter or filter bag in an area with good water flow, such as exterior or internal filters.
  • Use our Substrate Cleaner regularly to remove phosphate deposits. During this application, Sili-Out 2 has to be removed from the aquarium cycle until the water is clear again.
  • The ideal phosphate value in saltwater aquariums should be between 0.02 – 0.05 mg and the silicate value should be ‘non-detectable’.
  • Use Sili-Out 2 (aluminium-based) alternating with Phos-Out 4 (iron hydroxide-based), to avoid unwanted enrichment of aluminium or iron.

Can be optimally combined with

PHOS-OUT 4 Phosphate Remover


CARBOPURE Activated Carbon


ZEOPURE Zeolite coarse 5 – 9 mm


ZEOPURE Zeolite fine 1,5 - 3 mm