I would like to know what the formula of salt
per 100 gallons of water is. I have some stressed fish...
Formula for Salt in Koi Ponds:
1.0 lb salt/100 gal = 1.25 ppt (parts per thousand)
lb/100 gal = 1.88 ppt
2.0 lb/100 gal = 2.5 ppt
2.5 lb/100 gal = 3.125
For amount of salt to add to get to a desired concentration
Lb salt to add = (total gallonage of your system/120)
multiplied by (desired salt conc. in ppt - current salt concentration in ppt)
Pond system volume: 4400 gal
concentration: 1.5 lbs/100 gal = 1.88 ppt
Current salt concentration = 0.6
Lbs salt needed = (4400/120) x (1.88 - 0.6)
= 36.666 x 1.28 = 46.99 lbs salt
Remember to add gradually,
and preferably not into your filter inlet feed. Waterfall or stream is best.
note that salt as a constant additive probably confers no provable benefit to
the health of a fresh-water fish. It is useful in early spring to prevent methemoglobinemia
("brown blood disease") caused by accumulation of nitrite as the populations
of bioconverting bacteria emerge at their own characteristic rates from dormancy.
1.5 lbs per 100 gallons (1.88 ppm) is probably enough. Wash the levels back down
towards zero with water changes as your water warms up and your bioconversion
fully kicks in.
Note that the above formula can
be manipulated to give you a fairly accurate figure for pond volume if you know
how much salt you added and have salt concentration figures for before and after