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Re: [GSAS-Member] Dry Fertilizers - A Public Service Message



I wanted to add a followup to Shango's helpful message about the Estimative
Index fertilizing method. In my reading I saw that adding magnesium via
epsom salts is recommeded if you have very soft water. We do here, maybe not
that soft... but I certainly have soft water because I am using RO/DI water.


Per Barr's article <http://www.abaquaria.com/forum/showthread.php?t=2>,
MgSO4 should be added once a week, to 7 ppm. The solution is described as--

Magnesium Sulphate - 70g to 500ml of water and add 50ml once a week per 100L
of water

If my math is right that is 7 grams per approx. 26 gal, once a week... which
would be more than 21 g in my 90 gal tank depending on true water volume.

That seemed like a lot until I remembered that epsom salts are actually a
hydrated compound, with 7 H2O for each MgSO4. More than half the weight of a
given amount of epsom salts is actually water, so it's not as much as it
looks like.

Still, with this method the water changes will be very important.

All I need to pick up is the potassium phosphate. Hopefully one of the many
hydroponics places in the Fremont area will have some so I don't have to go
all the way to Burien.

MS
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