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re: Scales and Balances
James Purchase is thinking about getting precise with his dosing, and
wondering whether he needs sensitivity to .1 or .01 grams. Ghazanfar Ghori
pointed out that the chemical composition of the water coming out of the tap
is already pretty variable (assuming you are not using reconstituted r/o
water or something like that).
I have two more questions:
1. Do you know how much water is in your tank? I sure don't. My plant tank
is nominally 72 gallons, but I doubt if it would hold that much empty. There
is also the space taken up by substrate, driftwood, plants, and fish. I
guess you could fill the tank up gallon by gallon, or use some sort of
metered delivery system to find out, but that seems like an awful lot of
work in any tank larger than 10 gallons or so. So there may be a fair amount
of uncertainty there.
2. Just for fun, I went over to Chuck Gadd's dosage calculator. I assumed a
50 gallon tank, and set the amount of water to mix with to 1ml of water, so
that I could see what the difference would be if I tossed the whole amount
in at once. The difference between using 1.10g KNO3 and 1.19g KNO3 is .26
ppm in a 50 gallon tank. Given the small size of that difference, I would
think that the .1 resolution would probably work well, unless the tank were
really, really small.
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