Quote:
Originally posted by Mr. Ugly
.8*425+.2*320=404
also
375=y*320+(1-y)*425
y=48% water change to get to 375
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Thanks, Mr.Ugly! I am sure I learned this in high school but that was a LONG time ago!!
So, check my math here. If using the example above, you have a 120 gallon tank that is measuring 420 calcium and you do a 20% water change that causes your display calcium to go down to 375, the water change water would have to be approximately only 200ppm calcium?? Wow!
RBursek- It looks like you should double check your tests man just to be safe, or you got a REALLY bad batch of salt.
Can the same formula you supplied, Mr Ugly, be used with other parameters, like mag?