Join Date: Feb 2018
Location: Puget Sound, WA
Ok so I have made a calculator and I entered your info. Ill clean it up and try to upload it.
From Seachem Equilibrium Website:
To raise mineral content/general hardness (GH) by 1 meq/L (3 dH), add 16 g (1 tablespoon) for every 80 L (20 US gallons).
You have 1.5 TBSP so (16 + (16/2) ) = 24 grams per 33 gallons 124 Liters.
From my Calculator
Total meq/L: 144.126
meq/L in 124 Liters: 1.153
dGH Ca: 2.162
dGH Mg: 1.066
Total dGH: 3.236
Ca to Mg Ratio: 3.339
If making you own version with dry powders:
Fe DTPA 11%: 0.227g
Either of these versions will add in ppm:
Original info I made the calculator with gotten from:
Thread: KH up solutions, pg 5 post # 68, writen by (unissuh, Moderator)
Here we go, Seachem's reply:
16 grams Equilibrium x 0.0806 Ca = 1.290 g Ca
1.290 g Ca/40.08 g/mol = 0.03219 mol Ca
0.03219 mol Ca x 2 = 0.06438 eq Ca = 64.38 meq Ca
We do the same for magnesium (2.41%) using the atomic weight of 24.312:
16 grams Equilibrium x 0.0241 Mg = 0.386 g Mg
0.386 g Mg/24.312 g/mol = 0.01588 mol Mg
0.01588 mol Mg x 2 = 0.03176 eq Mg = 31.76 meq Mg
Add together: 64.38 + 31.76 = 96.14 meq
Divide this by 80 L and we get 1.2 meq/L
The label says 1.0, so if measured absolutely accurately, the label understates the
amount of hardness added. The label also says one tablespoon per 80 liters, and there
is some flexibility in that instruction. A tablespoon is typically taken as 15 grams of
water, but the density of Equilibrium is greater than that of water, hence the slightly
The label also states that one meq/L is approximately 3 dGH. That is a rounded
number. The appropriate conversion factor is 1 meq/L = 2.8 dGH, but nonetheless it is
The conversion factor of 2.8 is a result of the definition of dGH. One degree of general
hardness is taken to be 10 ppm of CaO. For the purposes of this calculation, we take
ppm and mg/L to be equivalent (and at this dose of Equilibrium, they are fairly close).
1 meq/L = 0.5 mmol/L x 56.07 mg CaO/mmol = 28.035 mg CaO/L
28.035 mg CaO/L x 1 dGH/10 mg CaO/L = 2.8 dGH
Last edited by unissuh; 03-02-10 at 12:15 PM.