1000ml
For a stable pond environment and proper plant growth, levelling the hardness (GH value) of the pond water is of utmost importance. More so as biological processes in the water continuously reduce it. The GH value is expressed in German degrees of hardness (GH). A correct hardness should vary between 8 and 12 °GH.
Also available -
GH Plus 250ml (1330620)
GH Plus 500ml (1330622)
