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Old 05-16-2012, 02:21 PM   #1
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Water changes with fresh water??

I have heard that doing water changes with saltwater will eventually lead to really high salinity levels overtime since salt doesnt leave the water... I was told to do water changes with fresh water to dilute the salinity, is this true?
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Old 05-16-2012, 02:26 PM   #2
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nope not at all true. You top off any evaporated water with fresh unsalted water but water changes are always done with salt water that should match the salinity in the tank.
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Old 05-16-2012, 02:29 PM   #3
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I assume filtered water right?
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Old 05-16-2012, 02:36 PM   #4
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Ro/di water which is reverse osmosis deionized.

You do water changes with saltwater not freshwater. When you do a water change you are removing saltwater and replacing with saltwater. The salt does not stay in during a water change. Only evaporation leaves the salt behind in which case you (top off) with freshwater.
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Old 05-16-2012, 02:40 PM   #5
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Ro/di is freshwater right, the kind is sold at lfs?
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Old 05-16-2012, 02:50 PM   #6
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Most lfs sell both. ro/di and ro/di saltwater.
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Old 05-16-2012, 02:56 PM   #7
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They should be selling ro water, if they only refer to it qs fresh water I would confirm with them that it is ro and not tap water.
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Old 05-16-2012, 03:05 PM   #8
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^ good point.

You want 0 TDS water. Tap will not come close. My tap runs at about 300 TDS. Your water is critical in salt tanks so best not to use tap.
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Old 05-16-2012, 03:43 PM   #9
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Thank you everyone for replying and for all the info, I really appreciate it.
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Old 05-20-2012, 08:00 PM   #10
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Anytime you remove saltwater from your tank, replace it with saltwater, anytime you add water due to it getting low from evaporation, use freshwater.
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