how much calcium nitrate in ro
- Thread starter makka
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smokeyjoejoe
Well-Known Member
Shouldn't think there will be any in RO water thought that was the point to strip it of all the elements that you would get from tap water
makka
Well-Known Member
Yeah I know lol I got calcium nitrate and Epsom salts but need to know how much of each in ppm I should add
smokeyjoejoe
Well-Known Member
I only use epson salts as I use tap water and add 1 teaspoon to 20 litres of water gives me about 0.2 ec on top of my tap water
makka
Well-Known Member
That's what I looking for thanks so I'm aiming 100 ppm mg and any clue on the calcium nitrate
smokeyjoejoe
Well-Known Member
I would probably add the same to your water first and see what the meter says or try half a teaspoon and up it you can always add more to your water if needed just a pain when it goes over and you have to start over again. I would try for 100 as well I know if your using cal/mag straight from the bottle there usually the same ratio
makka
Well-Known Member
OK thanks would I need to add extra calcium due to the extra mg
smokeyjoejoe
Well-Known Member
I'm not 100% sure on that I don't want to say yes and you end up with a nute lock out, sorry mate
makka
Well-Known Member
Does the label mention tetrahydrate? If not, its likely just a bottled greenhouse grade like calcinit which costs around £15 for 25kg.
To approximate a "full strength" (10ml per us gallon) dose of Calmag, use 0.415g of GG calcium nitrate per litre and 0.314g of epsom per litre. This wont give you any added Fe that calmag does and it will add S which calmag doesnt. but it will give you around the same N, Mg and Ca.
Be aware these two chemicals are not compatible in a concentrated solution so dont go mixing them together in a bottle or you`ll create a stodgy mess that wont dissolve in water
To approximate a "full strength" (10ml per us gallon) dose of Calmag, use 0.415g of GG calcium nitrate per litre and 0.314g of epsom per litre. This wont give you any added Fe that calmag does and it will add S which calmag doesnt. but it will give you around the same N, Mg and Ca.
Be aware these two chemicals are not compatible in a concentrated solution so dont go mixing them together in a bottle or you`ll create a stodgy mess that wont dissolve in water
makka
Well-Known Member
Thanks very much so just over 4g cal nitrate to a litre and just over 3 gram epsom would give me close to calmag with extra sulfur and no added iron am I correct???Does the label mention tetrahydrate? If not, its likely just a bottled greenhouse grade like calcinit which costs around £15 for 25kg.
To approximate a "full strength" (10ml per us gallon) dose of Calmag, use 0.415g of GG calcium nitrate per litre and 0.314g of epsom per litre. This wont give you any added Fe that calmag does and it will add S which calmag doesnt. but it will give you around the same N, Mg and Ca.
Be aware these two chemicals are not compatible in a concentrated solution so dont go mixing them together in a bottle or you`ll create a stodgy mess that wont dissolve in water
And add each salt separate to the same 1 litre??
Its 0.415g per litre (less than half a gram) so if you`ve got 10L of ro water, you`d add 4.15g of calcium nitrate and 3.14g of epsom. Dont forget those weights will give you the equivalent of full strength calmag (10ml/gal), where most will only use it at half strength (5ml/gal).
To get half strength use half of the weight, ie; calcium nitrate at 0.2075g per litre and epsom at 0.157g.
To get half strength use half of the weight, ie; calcium nitrate at 0.2075g per litre and epsom at 0.157g.
makka
Well-Known Member
Thank you very much
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