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Old 11-01-2013, 06:43 PM   #11
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I see where you are coming from, but in reality tap is adding stuff to the water without a doubt. You are not adding cleaner water than is in the tank. get a tds meter from ebay for under 10 bucks and then go from there if you dont believe me. lol

My tap has no nitrates, trace phosphates and reads 140tds. thats 140 of "stuff" that is in the water. I go through the ro/di unit and it has zero nitrates, phosphates and more importantly, ZERO tds. So therefore, I am adding higher quality water than I am removing.
I dont add any chemicals usually unless really needed and feeding will add things regardless of the water source. I know youre trying to angle this so tap is ok, if thats all you can do fine, I understand, but in reality it is not as clean as you think. The water company adds all sorts of stuff to tap water, chemicals and flouride and other stuff.
If you are on well water then you risk heavy metals and other organic things.
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Old 11-01-2013, 07:04 PM   #12
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I'm only suggesting tap might be ok for water changes. For top off this is a big no.

My question is what is the tds of the SW once you add the salt? And what is the tds of your tank before the wc?

I will certainly get a tds meter to measure that. But once you mix salt I think the measurement is screwed because of all the ions. From what i red its a measurement of electrical resistance of the water. What do you think?

Thanks for all the comments. I'm just putting an idea on the table.
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Old 11-01-2013, 07:09 PM   #13
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I confused my tds meter when attempting to read saltwater, freshly made. It has so many elements in the salt mix that your corals consume that it will skewer the results, for sure.
The difference between the high tds of salt mix and tap is the actual dissolved solids, in salt mix these are purposely added and needed by critters in your tank, tap has other additives that are not good for the critters. Good and bad tds I guess is the simple answer. lol
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Old 11-01-2013, 07:11 PM   #14
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Quote:
Originally Posted by Blenny View Post
I'm only suggesting tap might be ok for water changes. For top off this is a big no.

My question is what is the tds of the SW once you add the salt? And what is the tds of your tank before the wc?

I will certainly get a tds meter to measure that. But once you mix salt I think the measurement is screwed because of all the ions. From what i red its a measurement of electrical resistance of the water. What do you think?

Thanks for all the comments. I'm just putting an idea on the table.
I don't understand why it is a big no for top off but not water changes...that just doesn't make sense to me. You measure Tds before you mix the salt and you want it to be 0 so you're not putting anything odd into your tank. Salt mixes are made with the correct compounds to match ocean water and give corals the things they need. It may contain minor extras but the ions in that are what you want.
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Old 11-01-2013, 07:41 PM   #15
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For the same reason you don't top off with salt water. It will concentrate anything that is in the water over time.
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Old 11-01-2013, 08:03 PM   #16
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actually, you dont top off with saltwater cause it will raise the salinity.
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Old 11-01-2013, 08:05 PM   #17
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No you don't too off with saltwater because salt doesn't evaporate...if you did you would just continue to raise your sg. I'm sure the distilled you use to top off still has a bunch of crud in it. This is kinda pointless arguing because we can't test for exactly what te dissolved solids are. I top my tank off with saltwater if my sg is low, am I concentrating dangerous chemicals? IMO no, people with very heavy sps systems dose kalk and those systems don't crash down the line due to too much calcium or alkalinity. I guess I just don't see your side of the argument. It just doesn't make sense to me especially since I used to use tap and distilled and had problems with both.
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Old 11-01-2013, 08:19 PM   #18
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Distilled or RO/DI is the closest we can get to pure water.

You are right that we don't know all that's in the tap water tds. That is exactly my point. I don't want these unknown potential contaminants to concentrate in my tank because they will not evaporate.

Regarding kalk, it will for sure not crash for Calcium or Alkanity, I was referring to contaminants that are present in lime at ppb levels. You are right that using high quality additives and salt mix makes this a non issue in most applications.

I don't want to argue just want to explain my pov.
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Old 11-01-2013, 08:28 PM   #19
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Quote:
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Distilled or RO/DI is the closest we can get to pure water.

You are right that we don't know all that's in the tap water tds. That is exactly my point. I don't want these unknown potential contaminants to concentrate in my tank because they will not evaporate.

Regarding kalk, it will for sure not crash for Calcium or Alkanity, I was referring to contaminants that are present in lime at ppb levels. You are right that using high quality additives and salt mix makes this a non issue in most applications.

I don't want to argue just want to explain my pov.
Haha I do understand and yes using ro/di is the purest we can get.
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Old 11-01-2013, 10:47 PM   #20
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I used both distilled and water from one of the water machines inside krogers. With my kroger card I got the distilled for $.77 a gallon. Then after hurting my back I bought an RO/DI unit since I can't lift those buckets like I use to. But I would quite using tap water.
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