Hello, I remember seeing an aquarium salt dispenser at my LFS, do they exist? Or would the closest thing be a auto top off system.
An ATO delivers fresh water to an aquarium for evaporation.
I have never heard of a salt dispenser and it wouldn't be a good idea if they did exist. Putting unmixed salt into your tank is a bad idea. The granules can get into fish gills and coral mouths and kill them. Always pre mix your salt.
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What if you have an automated water changer and you do an automated salt dispenser in a sump? Might work in that situation.
Try one of those water softners that use salt.
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Not the same salt.
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You don't want to top off with SW anyways because when the water evaporate it leaves the minerals behind. You only want to top off with RO/DI water and only add new SW when you are doing water changes and physically siphon water out of the tank.