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Why is premixed MS the cheapest?

PostPosted: Sun Jan 19, 2014 12:05 am
by xr280xr
I'm looking to buy MS macro, micro, and vitamins separately. I thought they would've been cheaper or about the same price that way, but they seem to be more expensive. For example, phytotechlab has the mixed macro & micro for $7.20 but individually they are 7.20 each (10L). For around a dollar more, you can also get it with the vitamins and sucrose. Is this normal and do you know why?

Re: Why is premixed MS the cheapest?

PostPosted: Sun Jan 19, 2014 7:48 pm
by Matt
I think it is normal, but I can't really venture a guess as to why.

Re: Why is premixed MS the cheapest?

PostPosted: Mon Jan 20, 2014 1:59 am
by xr280xr
Well, assurance I'm not misreading the specs is the important part. Thanks!

Re: Why is premixed MS the cheapest?

PostPosted: Thu Feb 13, 2014 4:10 am
by Starchy
What's the difference between macro and micro?

Re: Why is premixed MS the cheapest?

PostPosted: Thu Feb 13, 2014 5:14 pm
by xr280xr
They contain different compounds. As you may guess, the micronutrients are in much smaller quantities.

MS Macronutrients
Ammonium nitrate (NH4NO3) 1,650 mg/l
Calcium chloride (CaCl2 · 2H2O) 440 mg/l
Magnesium sulphate (MgSO4 · 7H2O) 370 mg/l
Potassium phosphate (KH2PO4) 170 mg/l
Potassium nitrate (KNO3) 1,900 mg/l

MS Micronutrients
Boric acid (H3BO3) 6.2 mg/l
Cobalt chloride (CoCl2 · 6H2O) 0.025 mg/l
Cupric sulphate (CuSO4 · 5H2O) 0.025 mg/l
Ferrous sulphate (FeSO4 · 7H2O) 27.8 mg/l
Manganese sulphate (MnSO4 · 4H2O) 22.3 mg/l
Potassium iodide (KI) 0.83 mg/l
Sodium molybdate (Na2MoO4 · 2H2O) 0.25 mg/l
Zinc sulphate (ZnSO4·7H2O) 8.6 mg/l
Na2EDTA · 2H2O 37.2 mg/l

I've read about protocols using a diluted MS media with full micronutrients so I wanted to buy them separately. Since buying MS Macronutrients only was more expensive than full MS, what I ended up doing to slightly save costs was buy full MS media and an additional packet of micronutrients. So I can dilute the full MS and supplement micronutrients into it to bring them back up to full strength.