I saw that people mark there system with a line so they know when to add more water. Where's the best spot on the aquarium or sump to draw the line so I know when to add more Ro di water?
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Still new is that good or bad?Ato allows the addition of lime for kalkwasser.
If you have a traditional sumped tank with baffles in the sump then the only part of the setup with varying water level (while the tank is running) is the compartment with the return pump. So, to answer your question directly, the only place marks would be useful is the compartment in your sump with your return pump. Now, how you decide what's the maximum level depends on your overflow volumes etc.