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February 01, 2023



Alphgrog is a volcanic rock, proven to be a successful filter media as it ideal for the colonisation of beneficial bacteria. The porous compostion of this media allows the bacteria to multiply in abundance over a short period of time.

The sharp edges of this natural rock require careful handling, and it is best situated in the last chamber of your filter, as you would not want your Koi rubbing against it!

Remember to wear protective gloves whilst cleaning.

SKU Description Price Order
ALPHA Alphagrog (Large Pieces) 15kg Bag £ 15.95 Add To Cart