I turn off my Kalk top off when I use this method to do my water change. It takes me approximately 4 hours to get 10 gallons of very wet skimmate. I do it when I know i'll be around the house. It would be cool to set up a auto topoff, maybe with a dedicated skimmer on a timer and multiple float switches to do the water changes for you.
Later,
Jim
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Richmond Reef Club
Current Tank Info: 90 Gallon AGA, Bare Bottom, (02) 10" Skylights, 216 Watts T5HO, (04) 4 watt cree LED's, Deltec AP600 Skimmer
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