this was my first app in the AppStore.
it was first published in the summer of 2012 and is still available in the AppStore.
This is a little helper to assist you with your regular water change in you Reef Aquarium.
You can specify the size of your tank in liter, the amount of water you want to change, the salinity you currently have, the salinity you want to arrive at in your tank and the amount of salt, of your salt of choice, needed per liter of water.