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Old 08-01-2009, 05:43 PM   #1
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Water Top Off Benefits?

Is it better to top off with RO/DI water or already prepared water?
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Old 08-01-2009, 05:53 PM   #2
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Top off evaporation? For that just use RO/DI water. Do you mean prepared salt water or fresh water?
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Old 08-01-2009, 05:58 PM   #3
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Only top off w/ non salt water... Salt does not evaporate, so as evaporation happens your SG increases. Replenishing with FW brings the SG back inline.
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Old 08-01-2009, 09:35 PM   #4
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Ok... So what your saying is I can't top off my Water with saltwater that's already prepared @ 1.026 since my water parameters are already @ 1.026? What's the difference between topping off with RO/DI water than using prepared saltwater that's already mixed? Then if that was the case then Why even do a water change? I know about evaporation correct Salt does not evaporate. But since it does not evaporate your still having the same salinity if your topping off with RO water than topping of with saltwater that is already prepared and mixed to your desired salinity. And if your doing a water change aren't you changing your water to the exact salinity your gravity is at? Maybe I am just looking at it all wrong.
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Old 08-01-2009, 09:37 PM   #5
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Just a Thought but I been topping off with RO/DI water for a long time
But just recently I have been doing top offs with my salinity being @ 1.026 and it has not climb above that. Also I have seen a spike in growth of my SPS and Coraline Algae....
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Old 08-01-2009, 09:41 PM   #6
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Maybe I am just looking at it all wrong.
Yes you are looking at it wrong. If you top off with SW then you are adding more salt to the mix. You have what salt was already in there plus now all the salt you are adding. Hope that makes sense.
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Old 08-01-2009, 09:43 PM   #7
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But if your doing a water change don't you still have to set it to a specific gravity to keep your salinity from raising above that?
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Old 08-01-2009, 09:46 PM   #8
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Ok... So what your saying is I can't top off my Water with saltwater that's already prepared @ 1.026 since my water parameters are already @ 1.026? What's the difference between topping off with RO/DI water than using prepared saltwater that's already mixed? Then if that was the case then Why even do a water change? I know about evaporation correct Salt does not evaporate. But since it does not evaporate your still having the same salinity if your topping off with RO water than topping of with saltwater that is already prepared and mixed to your desired salinity. And if your doing a water change aren't you changing your water to the exact salinity your gravity is at? Maybe I am just looking at it all wrong.
Water changes are about much more than salinity. Your salt mix contains elements that the animals including corals need. Calcium, magnesium, trace elements, etc. The water changes replenish what is used up in your system and removes the bad. How are you testing your salinity? If you're topping off with SW versus RO, I suspect it's quite a bit higher than you think.
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Old 08-01-2009, 09:53 PM   #9
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With a water change you are diluting some of the toxins in your tank and you are replacing some of the trace elements that are used up over time. Yes, you have to do a water change with the correct specific gravity water.

*Looks like we was posting the same thing at the same time*
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Old 08-01-2009, 09:53 PM   #10
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LOL... I understand the concept of water chemistry and quality just trying to start a debate.... but anyhow if I do weekly water changes and topping off during the week with RO water. How do I know if my Salinity will not raise with weekly water changes compared to topping off and my salinity staying at a steady 1.026? I mean I am using a Refactometer.
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