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04/16/2017, 11:19 AM
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#1 |
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Registered Member
Join Date: Apr 2017
Posts: 1
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Need formula to reduce density/salinity
Hello,
i prepared an excel file to calculate and track my water changes. Actually i am struggling to find a formula to calculate the following: Density in my tank is 1,0240 CM³/ 37,24 psu and i want to calculate the amount of freshwater(water change in liter/oz) required to reach 1,0232 CM³/ 34,86 psu. Can anyone help me with that please? Regards Jimboo |
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04/16/2017, 03:45 PM
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#2 |
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Registered Member
Join Date: Mar 2017
Location: NM
Posts: 523
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Maybe do it manually one time, note the procedure and create a formula accordingly.
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Get a life! Current Tank Info: 20gL mixed reef, 10g mixed reef w/nem & clown, 5g NPS & harlequin |
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04/16/2017, 04:24 PM
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#3 |
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Registered Member
 
Join Date: Apr 2008
Location: Grove City, Ohio
Posts: 10,806
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That sounds like way too much work. Why not just mix some up at slightly less than your target value (which, btw, is actually a bit low for most corals) and go from there?
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I'll try to be nice if you try to be smarter! I can't help that I grow older, but you can't make me grow up! Current Tank Info: 120 mixed reef with 40b sump, RO 150 skimmer, AI Sol Blue x 2, and a 60g Frag Tank with 100g rubbermaid sump. 2 x Kessil A360w lights, BM curve 5 skimmer |
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04/16/2017, 04:45 PM
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#4 |
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Registered Member
Join Date: Dec 2013
Posts: 2,062
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Why are you using density?
Last edited by SFish; 04/16/2017 at 04:51 PM. |
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04/16/2017, 05:30 PM
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#5 |
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Registered Member
Join Date: May 2015
Location: South Africa
Posts: 170
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04/16/2017, 06:07 PM
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#6 |
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Registered Member
Join Date: Mar 2017
Location: NM
Posts: 523
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Nice link.
__________________
Get a life! Current Tank Info: 20gL mixed reef, 10g mixed reef w/nem & clown, 5g NPS & harlequin |
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04/16/2017, 06:08 PM
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#7 |
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Registered Member
Join Date: Dec 2013
Posts: 2,062
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You would have to figure out the density of a solution of salt at the proper concentration. Mix up a L of salt at the proper concentration. The salt is part of the L so don't use a L of water then add salt. From there you can figure out how much salt you need in a L.
Ex (just making up numbers) Lets say there are 500g in 1L to get you at an SG of 1.026 So say you want to make 4L 4L (500g/L)=2000g of salt you would need keep in mind that the 2000g is part of the 4L Last edited by SFish; 04/16/2017 at 06:28 PM. |
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04/16/2017, 06:36 PM
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#8 |
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Registered Member
Join Date: Apr 2016
Location: Central Nebraska
Posts: 3,190
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It's not too bad. We just calculate what % the new density is of the old density. Then 1 minus that % times total water volume of the tank.
23.2 ÷ 24= 0.9666 1 - 0.9666= 0.0334 0.0334 x total tank volume is how much saltwater you will replace with freshwater. So about 3 1/3 gallons for a 100 gallon tank.
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Pat Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers |
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04/16/2017, 06:37 PM
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#9 | |
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Registered Member
Join Date: Dec 2013
Posts: 2,062
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Quote:
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