I drip Kalk for my topoff. Assuming you have an idea of how much water evaporates in a day, I set my kalk to drip at a rate equal to my evap rate (approximately). For my setup it is 1 drip per second.
My fresh Saltwater is set on my float valve and is replaced equal to that which is skimmed out. I do check my salinity once a week to make sure things are in check.
Hope this helps!
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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