Sera KH Test Kit for testing KH in fresh or saltwater aquariums.
KH can be increased in both freshwater and saltwater aquarium by adding the appropriate KH powders.
For freshwater aquariums, we recommend  Dupla KH+.
For saltwater aquariums, we recommend either Seachem reef builder or Dupla KH+.
Both products are available from our store in the conditioner catagory.