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| ppm or ppt what the difference. http://byap.backyardmagazines.com/forum/viewtopic.php?f=1&t=4314 |
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| Author: | bluefin [ Oct 14th, '08, 16:56 ] |
| Post subject: | ppm or ppt what the difference. |
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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| Author: | Food&Fish [ Oct 14th, '08, 17:07 ] |
| Post subject: | Re: ppm or ppt what the difference. |
ppm parts per million we normaly run ppt parts per thousand 1 kg in 1000 litre = 1 ppt |
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| Author: | RupertofOZ [ Oct 14th, '08, 17:08 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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....   ... not even sure it does to me...
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| Author: | bluefin [ Oct 14th, '08, 17:13 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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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| Author: | hygicell [ Oct 14th, '08, 17:14 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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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| Author: | bluefin [ Oct 14th, '08, 17:19 ] |
| Post subject: | Re: ppm or ppt what the difference. |
so what is the recommended rate for general fish health in an ap system? What can s perch tolerate? |
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| Author: | RupertofOZ [ Oct 14th, '08, 17:33 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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...
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| Author: | RupertofOZ [ Oct 14th, '08, 17:36 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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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| Author: | hygicell [ Oct 14th, '08, 17:42 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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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| Author: | RupertofOZ [ Oct 14th, '08, 17:45 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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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| Author: | Food&Fish [ Oct 14th, '08, 17:53 ] |
| Post subject: | Re: ppm or ppt what the difference. |
+ 1 |
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| Author: | Gilly [ Oct 14th, '08, 17:55 ] |
| Post subject: | Re: ppm or ppt what the difference. |
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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| Author: | Food&Fish [ Oct 14th, '08, 17:59 ] | ||
| Post subject: | Re: ppm or ppt what the difference. | ||
Yep its called a refractometer [ebay $30]
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| Author: | Gilly [ Oct 14th, '08, 18:01 ] |
| Post subject: | Re: ppm or ppt what the difference. |
That was quick. Thanks 
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| Author: | Dufflight [ Oct 14th, '08, 18:02 ] |
| Post subject: | Re: ppm or ppt what the difference. |
Thought you were showing us you lightsaber before I read your post. 
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