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https://www.swelluk.com:443/oase-aquaactiv-pondlith/ 
Oase AquaActiv PondLith
Oase AquaActiv PondLith zeolite is a natural power mineral and will give your pond excellent water quality. Available now from Swell UK.
Product Information
Oase AquaActiv PondLith is a pure natural zeolite, grain size 5-10 mm. This special high-performance filter material for ideal for decomposing nitrogen compounds. It is simply fast aid for excessive ammonium.
Using the PondLith is great for filter support during the run-in phase. Using PondLith will withdraw the important nutrients that are the basis for green algae.
Per m³ pond volume 1 kg (without fish stock), 2 kg (with fish stock) or 3 kg (for koi ponds)