Help with Ca Mg/

[howard wolowitz]

Sorry to start a another thread

 

In another thread I was advised to sort my water out and mine needed a bit more Magnesium

an I needed Mono Magnesium or Epsom salt.

 

Bought the Mono Mg but have no idea how much I need to add...bottle just says add 1 or 2 ml and little else

 

Calcium 24.4

Magnesium 3.48

 

 

Only thing that's holding me back is this

 

[MindSoup]

The ratio is 3:1, so you need to add about 3.5mg/L. I use epsom salts so I don't know the maths for mono mag, but the information will be written on the bottle so you should be able to work it out. 

Edited December 14, 2023 by MindSoup

[Shumroom]

I think I did the start of the calculations in the thread below 

 

Atb

 

 

 

[Shumroom]

On 09/12/2023 at 4:21 PM, Shumroom said:

24.4/3 = 8.13mg/l this is the ideal amount of Magnesium for the amount of Calcium in your water  

 

Since you already have 3.48mg/l you only need to add 4.65mg/l of Magnesium.

 

You can do this using Epsom salts or mono Magnesium  

 

Let us know which you’ll use,

as there’s one more calculation to be made as they are both still only a % of pure Mg

 

Atb

 

 

 

Mono Mg is 7%  

 

Atb

 

 

 

[MindSoup]

That kind of maths makes my head hurt .

[Shumroom]

Since you require 4.65mg/l of Mg

if Mono Mg was 100% you'd give 4.65ml/l of water.

 

But it's not,

it's only 7%

 

4.65/7 x 100/1 = 66.428

 

So you need 0.066ml/l of mono Mg

 

I'm not sure if that's right

 

@Oldbear haven't seen you for a while,

could you double check me numbers please ?

 

Atb

 

 

 

[MindSoup]

But a 1ml weighs 1gram, which is 1000mg? So you'd need 0.0465ml? Not saying your wrong I'm already baffled. 

Edited December 14, 2023 by MindSoup

[howard wolowitz]

Just now, MindSoup said:

That kind of maths makes my head hurt .

 

Been trying to work it out for a few days not one person has come up with an answer until now

 

 

Edited December 14, 2023 by howard wolowitz

[howard wolowitz]

Just now, Shumroom said:

Since you require 4.65mg/l of Mg

if Mono Mg was 100% you'd give 4.65ml/l of water.

 

But it's not,

it's only 7%

 

4.65/7 x 100/1 = 66.428

 

So you need 0.066ml/l of mono Mg

 

I'm not sure if that's right

 

@Oldbear haven't seen you for a while,

could you double check me numbers please ?

 

Atb

 

 

 

hahah its better than my idea.... whack a ml in and hope for the best

[MindSoup]

Is there not something written on the bottle? Is the label a peel back book thing? Just saying 7% is weird, I thought mono was supposed to be the easier one to figure out, but Epsom is way easier, its just under 100mg of mag per g of epsom. 

Edited December 14, 2023 by MindSoup

[Shumroom]

Thanks @MindSoup I've been replacing the spread on my lunchtime rolls with coconut oil  

 

So you need 0.66ml/l of mono Mg 

 

So you need to give this every time you water,

except when running down nutrients at the end of bloom.

 

Just asking others does this look ok??

 

I'm fairly sure it's right 

 

Atb

 

 

 

[howard wolowitz]

Just now, MindSoup said:

Is there not something written on the bottle? Is the label a peel back book thing? Just saying 7% is weird, I thought mono was supposed to be the easier one to figure out, but Epsom is way easier, its just under 100mg of mag per g of epsom. 

 

 

All it says is add 1 or 2ml per 1ltr water

 

Ive Emailed them and asked them too HAHAHAHAH

[howard wolowitz]

Just now, MindSoup said:

Is there not something written on the bottle? Is the label a peel back book thing? Just saying 7% is weird, I thought mono was supposed to be the easier one to figure out, but Epsom is way easier, its just under 100mg of mag per g of epsom. 

 

Might be better if I just get some epsom

 

how is that worked out?

[MindSoup]

Just now, Shumroom said:

Just asking others does this look ok??

Yeah that's the same as I just worked.

 

It's 70,000mg/L 70,000/4.65= 15,053.7... and 1000/ 15,053.7...= 0.0664...

[ratdog]

do we have any photos of your plants?