The numbers are kinda rounded to keep it simple. By the time you extrapolate
the decimal from 1 gallon to 100 gallons, it goes up just a little bit.
Read a bit further down in the message and the conversion factors are
shown/proved (all in metric). I got this info from a trusted source who's
much better at math than I am: it's a "cheat sheet" that allows you to do
the math without having to access web-based calculators.
Lee
"Ken Russell" wrote in message
u...
One of your numbers is off by a factor of 10.
If 1 lb. of salt in 1 gallon of water = 1% salinity
Then this CANNOT be correct;
1 lb. of salt in 100 gallons of water = .12%
Ken Russell
"Lee B." wrote in message
...
| For those that need to calculate the size of their pond using salt, or
need
| to figure out how much to add:
|
| Salt in a Nutshell
|
|
|
| 1 lb. of salt in 1 gallon of water = 1% salinity
|
| 1 lb. of salt in 100 gallons of water = .12%
|
| (These are "generally accepted" numbers; if you want to "proof" the
numbers,
| it goes like this: 1 lb. salt /100 gallons water (convert to metric) =
454
| grams of salt / 378.5 liters of water = 454 grams of salt / 378,500
grams
of
| water = 0.001199 ppm, or 0.12%)
|
|
|
| If there is no salt reading in the pond:
|
| # salt x 12 / % salinity = gallons of water
|
| Example:
|
| 25 lbs salt x 12 = 300 / .3 (salinity) = 1000 gal.
|
|
|
| If there is an existing salt reading:
|
| R1 = Reading 1 (existing); R2 = Reading 2 (resultant)
|
| # salt x 12 / (R2-R1) salinity = gallons of water
|
| Example (Say the existing salt level was .15; after salt it was .3, so
the
| number we're looking for is .3 - .15 = .15):
|
| 50 lbs. salt x 12 = 600 / .15 = 4000 gallons
|
|
|
| To get # salt needed with known gallons:
|
| (desired % / 12) x gallons of water = # salt
|
| Example (If you want to achieve a .2% of salt in a 1500 gallon pond):
|
| .2/12 = .01666 x 1500 = 24.999 lbs. of salt (call it 25!)
|
|
|
| Note: If there are salt levels already in the pond, remember to subtract
R1
| from R2 to get your final reading; if you want a final reading of .2,
but
| the initial reading is .05, then the actual number you're looking for is
.15
| (not .2)
|
|
|
| I hope this helps.
|
|
|
| Lee
|
|
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