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Error,
plants need Ca : Mg in a ratio of 3 : 1 to 4 : 1.
You can get a test kit for Ca by Nutrafin Hagen that will help you to determine Ca and Mg concentrations.
First you measure GH and Ca, then calculate the rest, example:
GH 10 degree
Ca2++ 2 degree
--------------------------------------------------------------------------------
Ca2++ [ppm] = 20 x Ca2++ [degree]
40 = 20 x 2
Ca2++ 40 ppm
--------------------------------------------------------------------------------
Mg2++ [ppm] = (( 20 x GH [degree]) - ( 50 x Ca2++ [degree])) / 4.1
24.4 = (( 20 x 10 ) - ( 50 x 2 )) / 4.1
Mg2++ 24.4 ppm
--------------------------------------------------------------------------------
Ca 40.0 ppm
Mg 24.4 ppm
The tap water should be measured first and then going from that point on will lead you to more successful result.
I have grown plants for years in Ca of 10 to 20 ppm and never seen any deficiency. Large doses of CaCl2 cause contamination, chloride that fish don't feel happy about.
Edward
plants need Ca : Mg in a ratio of 3 : 1 to 4 : 1.
You can get a test kit for Ca by Nutrafin Hagen that will help you to determine Ca and Mg concentrations.
First you measure GH and Ca, then calculate the rest, example:
GH 10 degree
Ca2++ 2 degree
--------------------------------------------------------------------------------
Ca2++ [ppm] = 20 x Ca2++ [degree]
40 = 20 x 2
Ca2++ 40 ppm
--------------------------------------------------------------------------------
Mg2++ [ppm] = (( 20 x GH [degree]) - ( 50 x Ca2++ [degree])) / 4.1
24.4 = (( 20 x 10 ) - ( 50 x 2 )) / 4.1
Mg2++ 24.4 ppm
--------------------------------------------------------------------------------
Ca 40.0 ppm
Mg 24.4 ppm
The tap water should be measured first and then going from that point on will lead you to more successful result.
I have grown plants for years in Ca of 10 to 20 ppm and never seen any deficiency. Large doses of CaCl2 cause contamination, chloride that fish don't feel happy about.
Edward
