Quote:
Originally Posted by Tom R
Hi littlesilvermax
Do you have any suggestions on the quantities of Mag and Cal required to bring a 50G mix of Instant Ocean up to acceptable levels?
Tom R
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I haven't measured magnesium in 3 years. I use IO only.
I add about 250 ml to 40 gallons of IO made water, I do this prior to a water change. That increases the magnesium from about 1200 to about 1380, which is closer to NSW.
I then add about 8 teaspoons of calcium to the mix to bring IO's 350 ppm to about 430 ppm.
FWIW I always add the magnesium and calcium to the water BEFORE adding the salt.
I have been doing my monthly water changes like this (w/o measuring) for years now, and my mag, alk, cal are always very good. (I assume 1380 for magnesium, but I don't check anymore, 9, 430)
I usually check the test reports on RC and here regarding levels in IO salt, and it seems to be fairly consistent. I disregard the users that test one small batch, as it is not always mixed evenly through-out the pail. I go through about $15 of magnesium a year, and I save the $37 for a test kit.
Hope that helps.
For 50 gallons that would be 310 ml of magnesium and 10 tsp of calcium.