Water change & water conditioner - The Planted Tank Forum
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post #1 of 33 (permalink) Old 06-17-2020, 04:34 AM Thread Starter
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Water change & water conditioner

Which method did you guys use when doing water change?

1. Syphon the amount of water you want to remove out of the tank. Fill tap water in a bucket. Add water conditioner into it. Then add the treated water to tank.

2. Syphon the amount of water you want to remove out of the tank. Add water conditioner into the tank according to the amount of water you need to add. Add new tap water into the tank.


BTW, did you guys add water conditioner into the tank when you add new fish to help it acclimate? On the bottle of my water conditioner (Tension Gon) stated the amount of dosage to use when introducing new fish.


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post #2 of 33 (permalink) Old 06-17-2020, 02:32 PM
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#1 with small tanks.
#2 with large tanks.
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post #3 of 33 (permalink) Old 06-22-2020, 01:09 PM
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Actually number 2 would be to dose for the entire tank and then add your water. Not just dose for the amount of water added.
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post #4 of 33 (permalink) Old 06-22-2020, 06:45 PM
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Actually number 2 would be to dose for the entire tank and then add your water. Not just dose for the amount of water added.
Why? Presuming that the water conditioner is being added to neutralize any chlorine/chloramine in the water, that amount is unchanged in either scenario, and the the reaction is pretty quick, even at low concentrations.
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post #5 of 33 (permalink) Old 06-22-2020, 10:25 PM
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Why? Presuming that the water conditioner is being added to neutralize any chlorine/chloramine in the water, that amount is unchanged in either scenario, and the the reaction is pretty quick, even at low concentrations.
Because you need the water conditioner to reach all parts of the tank with the untreated water. That's why the instructions are explicit about that. If you have a 100 gallon tank, and change 10 gallons of water in the tank, why would you add water conditioner for just 10 gallons? That 10 gallons has now distributed over the 100 gallons. That's why you dose for 100 gallons.
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post #6 of 33 (permalink) Old 06-22-2020, 10:39 PM
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Because you need the water conditioner to reach all parts of the tank with the untreated water. That's why the instructions are explicit about that. If you have a 100 gallon tank, and change 10 gallons of water in the tank, why would you add water conditioner for just 10 gallons? That 10 gallons has now distributed over the 100 gallons. That's why you dose for 100 gallons.
I'm going to disagree. The stoichiometry is unchanged. The neutralization reaction is going to be slower due to dilution, but the reaction is sufficient fast for it to not really matter. Unless there's some side reaction taking place that I am unaware of, but that seems doubtful in this instance.

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post #7 of 33 (permalink) Old 06-22-2020, 10:44 PM
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I'm going to disagree. The stoichiometry is unchanged. The neutralization reaction is going to be slower due to dilution, but the reaction is sufficient fast for it to not really matter. Unless there's some side reaction taking place that I am unaware of, but that seems doubtful in this instance.

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OK, let's make it easier. You have a 100 gallon tank. You change 10 gallons of water that has chlorine in it. Now that 10 gallons of water is distributing the chlorine throughout the tank. You dose for only 10 gallons that you put in, which is not enough to remove all the chlorine. You have only removed 10%. Pretty simple.


However, before you change the water, you dose the your dechlorinator in a 10 gallon bucket of water. Now when you pour in the 10 gallons, no chlorine anywhere.
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post #8 of 33 (permalink) Old 06-22-2020, 10:49 PM
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OK, let's make it easier. You have a 100 gallon tank. You change 10 gallons of water that has chlorine in it. Now that 10 gallons of water is distributing the chlorine throughout the tank. You dose for only 10 gallons that you put in, which is not enough to remove all the chlorine. Pretty simple.


However, before you change the water, you dose the your dechlorinator in a 10 gallon bucket of water. Now when you pour in the 10 gallons, no chlorine anywhere.
How does the chlorine multiply by ten when you add the new water to your tank?

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post #9 of 33 (permalink) Old 06-22-2020, 10:52 PM
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How does the chlorine multiply by ten when you add the new water to your tank?

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Actually it increases 100% as there is no chlorine in the tank before any water changes.
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post #10 of 33 (permalink) Old 06-22-2020, 10:53 PM
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Actually it increases 100% as there is no chlorine in the tank before any water changes.
Now that's just bad math. The amount of chlorine in the 10 gallons of new water is the same amount as the amount of chlorine in 10 gallons of new water plus 90 gallons of old water.

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post #11 of 33 (permalink) Old 06-22-2020, 10:54 PM
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Now that's just bad math. The amount of chlorine in the 10 gallons of new water is the same amount as the amount of chlorine in 10 gallons of new water plus 90 gallons of old water.

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Bingo, I think you've got it.
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post #12 of 33 (permalink) Old 06-22-2020, 10:54 PM
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Drinking water is about 3 ppm I believe, so if you dilute 10x, ie 10 gallons of new water into 90 gallons of old tank water, you now have 100 gallons of 0.3 ppm chlorine.

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post #13 of 33 (permalink) Old 06-22-2020, 10:56 PM
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I'm starting to think I'm being trolled here...

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post #14 of 33 (permalink) Old 06-22-2020, 10:56 PM
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Originally Posted by Bunsen Honeydew View Post
Drinking water is about 3 ppm I believe, so if you dilute 10x, ie 10 gallons of new water into 90 gallons of old tank water, you now have 100 gallons of 0.3 ppm chlorine.

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And that 0.3ppm is what folks are trying to remove.
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post #15 of 33 (permalink) Old 06-22-2020, 10:57 PM
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And that 0.3ppm is what folks are trying to remove.
100 gallons of 0.3 ppm chlorine is the exact same as 10 gallons of 3 ppm chlorine.

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