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bluefin
PostPosted: Oct 14th, '08, 16:56 
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Can someone set me straight 1kg of salt in 1000 lts of water equals 1 ppm, is that correct ? People quote ppt whats the difference?
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Food&Fish
PostPosted: Oct 14th, '08, 17:07 
Seriously, this cant be healthy.
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ppm parts per million we normaly run ppt parts per thousand 1 kg in 1000 litre = 1 ppt
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RupertofOZ
PostPosted: Oct 14th, '08, 17:08 
Nope 1kg in 1000ltr is 1 ppt... or think of it as 1kg in 1 kltr...

i.e 1/1000th of 1000gm(kg) = 1 gm... 1/1000th of 1000ltr(kltr) = 1ltr ... 1 ppt = 1gm/ltr... or 1gm in 1/1000th of a Kltr.. 1/1000th of 1000ltr... 1 part per thousand....

Make sense.... :wink: :lol: ... not even sure it does to me... :lol:
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bluefin
PostPosted: Oct 14th, '08, 17:13 
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ok so i have put approx 7kg of salt into my 2250 lt ft does that mean i have overdosed my s perch ?
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hygicell
PostPosted: Oct 14th, '08, 17:14 
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I was the person who suggested introducing a PPT Parts Per Total or PPV Parts Per Volume definition, Bluefin
and that is what you describe: 1kg (of salt) in 1000 liters of water

coincidentally as far as salt is concerned this corresponds to PPM with a factor difference of 1000, as 1 g/l = 1000 PPM:
"Seawater has a salinity of roughly 35,000 ppm, equivalent to 35 g/L"
http://en.wikipedia.org/wiki/Saline_water

so if I have it right a PPV of 1kg of salt per m³ of water or 1000 g/1000 liters would mean that the salinity of your water boils down to 1000 PPM

Frank
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bluefin
PostPosted: Oct 14th, '08, 17:19 
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so what is the recommended rate for general fish health in an ap system? What can s perch tolerate?
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RupertofOZ
PostPosted: Oct 14th, '08, 17:33 
bluefin wrote:
ok so i have put approx 7kg of salt into my 2250 lt ft does that mean i have overdosed my s perch ?


Nope about spot on... generally we salt at 3ppt... so for 2250ltr... 3 x 2.25 = 6.75kg... close... :wink:
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RupertofOZ
PostPosted: Oct 14th, '08, 17:36 
Treatment for some fungal problems use a salt dip... or bath... up to 12ppt... but either literally a dip or roll in the salt solution... or a short term bath...

Treatment for Ich in Silver Perch can involve up to 6ppt...

For reference sea water is 35ppt....
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hygicell
PostPosted: Oct 14th, '08, 17:42 
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RupertofOZ wrote:
For reference sea water is 35ppt....


be careful with definitions, Rupert
sea water salt contents is 35 PPM, not PPT

frank
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RupertofOZ
PostPosted: Oct 14th, '08, 17:45 
Sorry Frank... definitely 35ppt....

In Wiki... http://en.wikipedia.org/wiki/Seawater it is wrote:
On average, seawater in the world's oceans has a salinity of about 3.5%, or 35 parts per thousand.
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Food&Fish
PostPosted: Oct 14th, '08, 17:53 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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+ 1
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Gilly
PostPosted: Oct 14th, '08, 17:55 
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So if you add salt but due to evaporation, time etc you top up your water. How do you know what the salt % is.
Is there a test kit. :?
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Food&Fish
PostPosted: Oct 14th, '08, 17:59 
Seriously, this cant be healthy.
Seriously, this cant be healthy.
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Yep its called a refractometer [ebay $30]


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Gilly
PostPosted: Oct 14th, '08, 18:01 
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That was quick.
Thanks :D
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Dufflight
PostPosted: Oct 14th, '08, 18:02 
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Thought you were showing us you lightsaber before I read your post. :mrgreen:
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