During the cold winter months you will notice a increase in evaporation in your tank. This largely due to the air is drier and if you have a gas heater it will dry out the air even more. That is where a ato really comes in handy. Ato systems will add a small amount of water to your tank each time which helps keep your parameters stable. Not to mention not having to lift them heavy buckets of water every few days to replenish the evaporated water. Atos work just like a doser and you will not have the swings in your salinity as you do when adding water manually.
