Aqua Source Calcium Hardness is a specialised water treatment product designed to increase the calcium hardness in freshwater aquariums and ponds. This formula helps in stabilising pH levels and preventing harmful fluctuations, which is essential for the health and well-being of aquatic life. By ensuring the optimal calcium hardness, it not only supports the structural health of invertebrates like snails and shrimps but also creates a more stable environment for all aquatic inhabitants. 50 Test strips