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