increasing KH and GH.. What ingredients I need - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 08-12-2014, 06:52 AM Thread Starter
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My KH and GH is very low at around 1-2 (it becomes the required colour in just couple of drops).. (It is pressurised CO2 tank and pH is around 6.4-6.6)..

I will sure be understanding properly of what to do for KH GH and I am not going to add anything without understanding this properly. .

But I want to keep ingredients ready so that I can do that once i understand what and how of this (I want to go chemical way)

I have collected below for GH:

CaCl2.2H2O

MgSO4.7H2O

but I don't know for increasing KH what should I have.. Should that be CaCO3 or NaHCO3 ?

Please let me know. .

-AqEnthusiast

4ft x 1.5ft x 1.5ft (150 L, ~40 G) | EHEIM 2217 | SunSun 110 water circulation | ADA Amazonia | 4x54w GE StarCoat 6500k T5HO 6 hrs photo | pressurised CO2 start stop one hour before photo | CO2 reactor to canister outlet | EI alternate (kno3+kh2po4+k2so4) and (csm+b) | Weekly 50% wc with Seachem Safe | MgSO4.7H2O + CaCl2.2H2O and NaHCO3 at wc to maintain kh gh at around 4 and 6

Last edited by aqenthusiast; 08-12-2014 at 11:09 AM.
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post #2 of 6 (permalink) Old 08-12-2014, 07:14 PM
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If you have low KH and GH, why do you want to change that? That's ideal for plant growth/nutrient uptake. I would not mess with the water's natural hardness. Some of those things you listed like NaHCO3 can be deadly to your fish if you add just a bit too much because will cause the pH to swing suddenly.

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post #3 of 6 (permalink) Old 08-12-2014, 08:39 PM
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You can mix the CaCl2.2H2O and MgSO4.7H2O at a ratio of 3:1 to make a basic GH booster. Dose enough of that at water change to keep GH in the 3-5 range. This will ensure you plants won't run out of calcium or magnesium.

I typically would not worry about a KH of 2. The plants will do fine with that. It can make measuring CO2 a little more difficult. Adding enough NaHCO3 to target about 5 degrees KH is fine. I would try and prepare the water prior to adding it to the tank if you have sensitive fish or invertebrates.
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post #4 of 6 (permalink) Old 08-13-2014, 02:33 AM Thread Starter
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Many thanks exv for the precaution. . That is why said I am going to be careful in this understanding before adding. . But need to understand and have atleast the ingredients. . At more than few places I read little harder water is better for plants' over all flora..

Thanks zorfox for the information. .

I am chemically challenged and don't understand molecular weight calculations. .

What I need is something like x gms of y will increase z litre of water by 1dGH / dKH according to what is added. .

Searched for this a lot and below is what I could collate:

1/2 teaspoon of NaHCO3 in 100 ltr water makes that water +1dKH

which was translated in NaHCO3 grams to:

2.4 gms of NaHCO3 in 100 ltr water makes that water +1dKH

And

~2 gms of CaCl2.2H2O and 0.88 gms of MgSO4.7H2O in 100 ltr water makes that water +1dGH

And in those proportions to increase kh / gh as necessary. .

I collated this from below:

http://www.aquaticplantcentral.com/f...cl2-mgso4.html

this part in above:

"

To raise gH by 1 dgH in 1 gallon of water using calcium chloride dihydrate and magnesium sulfate heptahydrate while maintainig a 4:1 ratio of calcium to magnesium cations:

- Add 0.07939grams of CaCl2*2H2O
- Add 0.03328grams of MgSO4*7H2O

For 55 gallons, this would be 4.37 grams CaCl2*2H2O and 1.83 grams of MgSO4*7H2O.
"

i converted gallon to litres by 1 g = ~3.78 ltr

and

http://www.chelonia.org/articles/waterchemistry.htm

this part in above:

"

One teaspoon of baking soda added to 50 liters of water can raise the kH of the water by approx 4 deg dH

"

and i convered 1 teaspoon of NaHCO3 = 4.8 gms from below:

http://www.foodista.com/question/WTM...of-baking-soda



above are important points for me too understand as to what to add for how much for the need. .


please let me know if my understanding is correct or not as understood from above..

-AqEnthusiast

4ft x 1.5ft x 1.5ft (150 L, ~40 G) | EHEIM 2217 | SunSun 110 water circulation | ADA Amazonia | 4x54w GE StarCoat 6500k T5HO 6 hrs photo | pressurised CO2 start stop one hour before photo | CO2 reactor to canister outlet | EI alternate (kno3+kh2po4+k2so4) and (csm+b) | Weekly 50% wc with Seachem Safe | MgSO4.7H2O + CaCl2.2H2O and NaHCO3 at wc to maintain kh gh at around 4 and 6

Last edited by aqenthusiast; 08-13-2014 at 07:40 AM.
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post #5 of 6 (permalink) Old 08-13-2014, 03:31 PM
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Your understanding looks good. However, you can also simply use this calculator. It does the calculations for you. No need to become a chemist just to fertilize your tank.
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post #6 of 6 (permalink) Old 08-14-2014, 06:28 AM Thread Starter
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Thanks zorfox for the updates

Yes I want to use such a calculator and I use below one for my EI dosage:

http://calc.petalphile.com

I think it's similar but what I could not understand is that these calculators are not giving options for example say NaHCO3.. I could not find that in the list. . Am I missing something in how to use these calculators ?

-AqEnthusiast

4ft x 1.5ft x 1.5ft (150 L, ~40 G) | EHEIM 2217 | SunSun 110 water circulation | ADA Amazonia | 4x54w GE StarCoat 6500k T5HO 6 hrs photo | pressurised CO2 start stop one hour before photo | CO2 reactor to canister outlet | EI alternate (kno3+kh2po4+k2so4) and (csm+b) | Weekly 50% wc with Seachem Safe | MgSO4.7H2O + CaCl2.2H2O and NaHCO3 at wc to maintain kh gh at around 4 and 6
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