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· Captain Obvious
1,190 Posts
i've always been told that your ATO container should only contain the amount of water that can handle a complete flood/emptying if it does fail....

A good rule of thumb is 5% of your total water volume. so in my case i have a 15gal container feeding a total volume of 280gal (180gal tank + 100gal sump)

ATO's purpose is to keep the tank's salinity stable NOT so you can be lazy in not doing topoffs :agree:
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