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Originally Posted by Delphinus
Deb, I am curious, with the python hose, how do you know how much water you've taken out of the tank? Or I guess what I mean is, how do you know when to stop? After enough times you just know where the level should be if you want to replace the same amount from the rubbermaid?
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I drain from the top tank and refill there as well. My water is heated and aged so the occupants love this fresh waterfall.
So I know to drain four to five inches from when it has stopped draining into the sump. I use my magnavore to measure that distance. I always make sure to err on the side of caution so I end up with some new SW leftover for another tank.