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Old 05-13-2010, 07:42 PM   #1
dougdavis71
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can i keep adding water to marine tank once water evaporates


so i was told from a shop owner (25 years) to keep from doing a weekly, bi-weekly water change in my tank that i can just keep adding fresh water to the tank everyday because water evaporates and salt doesnt so this "method" doesnt shock fish and corals...it make sense but im curious to see what you guys think. thanks
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Old 05-13-2010, 07:59 PM   #2
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I moved your post here where it can get the attention that it deserves
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Old 05-13-2010, 08:48 PM   #3
shanalea
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weekly water changes should suffice if your parameters are ok.... LFS is right about topping off with fresh
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Old 05-13-2010, 09:01 PM   #4
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ya toping off evaporated water needs to be done with fresh water and water changes should probably still be done every two weeks. you should probably check your salinity to make sure its correct
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Old 05-13-2010, 09:03 PM   #5
quader94
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yes you should top off everyday, people install things call ATO's where it basically does the topping off for you

and yeah do water changes weekly
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Old 05-13-2010, 09:33 PM   #6
sks4613
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He is correct the water evaporates the salt stays. If you top off with salt water you SG will go through the roof.
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Old 05-13-2010, 09:42 PM   #7
JohnWesolowski
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Make sure that the top off water (just like the replacement water) has minimal or no nitrates and phosphates. Many do this with a RO/DI unit, or purchasing RO/DI water from a LFS. I use my well water that has been running with a PhoBan reactor for a few days.
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Old 05-13-2010, 09:53 PM   #8
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Welcome to TRT you have found the right place to aske great questions. there are lots of really smart people here (at least reefing smart) LOL, and they are happy to help at the drop of a post.

Everybody is right on the mark here including the LFS owner with 25 year exp. you want to do a daily or every other day top of of evaporated water with RO/DI water and use the same for your fresh water makeup.
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Old 05-14-2010, 09:47 AM   #9
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Top offs and water changes serve two different purposes.
You top off to keep the water level or volume correct which keeps your salinity level somewhat constant.
You do water changes to export the bad things which have built up in the water and to replace or supplement the minerals and elements that have been consumed by the inhabitants as part of the growing process.
You need to do both.
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Old 09-02-2010, 11:48 AM   #10
dmora723
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i top with freshwater every day. pouring it to a high flow area, in my case my external filter, then it has time to mix. but idk if u have ever scuba dived in the rain but you can see the salinity changing. and there are fish up there in it. and they seem fine.
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Old 09-02-2010, 11:55 AM   #11
Arctangent
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I think AZDesertRat gave a great answer. You NEED water changes for nutrient/toxin export as these things will not evaporate with the water (just like the salt doesn't).

Water change with saltwater.
Water topoff with freshwater.
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Old 09-02-2010, 12:08 PM   #12
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And both coming from an RO/DI system or distilled water in a pinch.
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Old 10-23-2010, 02:50 PM   #13
criscoco
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i have a question? do you pour the water direct from the container or you heat the water first so does not affect the temperature of the water in your tank
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Old 10-23-2010, 03:12 PM   #14
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Quote:
Originally Posted by criscoco View Post
i have a question? do you pour the water direct from the container or you heat the water first so does not affect the temperature of the water in your tank
that really depends. are u useing tap water? is so stop, but if u are its important to not use hot water, because your hot water tank has a lot of sediment built up in it. with ro/di or distiled your can heat the water to the correct temp it you want to.
i use a 1/8 air line, leave my container on top of the tank, than use the air line to make a siphon in to the tank, this really slows the process in witch water goes in (a good thing). however it should not change the temp much. i know that it takes 1 gallon of boiling water to make 54 gallons of 55 degree water, 70 degrees. and in the case of a top off, your just using a little bit of water. i do one quart every 2 days in my 55 gallon and 1 cup in to my 20 gallon every 2 days.
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Old 10-23-2010, 05:37 PM   #15
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You should be using RO/DI and the temperature should be close to the tanks temperature.
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