Increasing GH

H..

Member
Joined
4 Oct 2011
Messages
226
Location
Alnö
Hi chemists

I have this soft tapwater of total hardnes of 2,4 according to the analysis report at my municipas homepage.
And also my testkit say 2. (2drops)

I want to increase the total hardnes due to see if my crystalshrimps will do better. I would like to aim at around GH5 to see if the small ones will survive better then.

I have CaCl2, and MgSO4 to provide the water. and also sodium bicarbonate if this will increase GH

I have found pages that say how many ppm it will increase if added, but nothing about degrees of GH.

What should I add? Both Ca, and Mg. Or just one of each, or non of them, but something else?

Please help me with recepies to increase the GH.

H
 

Witcher

Member
Joined
15 Jan 2020
Messages
163
Location
London
To raise gH in 100l tank by 1 deg you need:

4.1g of MgSO4x6H2O (4.3ppm of Mg and 17.2ppm of SO4)

or

2g of CaCl (7.2ppm of Ca and 12.8ppm of Cl)

or percentage mixture of both if you want to keep certain proportions between Ca and Mg (usually 4:1 or 3:1 Ca:Mg).



To raise kH in 100l tank by 1 deg you need:

3g of NaHCO3 (8.2ppm of Na and 21.8 ppm of HCO3)



@Zeus. calc will definitely help you with fine tuning of the mixtures.
 

Oldguy

Member
Joined
27 Aug 2018
Messages
355
Location
Gloucestershire, UK
Hi chemists
General & total hardness are measured as if the hardness was all due to calcium carbonate, not that useful but we are stuck with it. I must prefer parts per million (ppm) which is very useful as it can be taken that mg per litre are ppm.

Temporary hardness is due to Gp II elements present as bicarbonates (hydrogen carbonates), thermally unstable and decompose to the carbonate (typically insoluble) water and carbon dioxide. Personally I find alkalinity to be a better measure of pH and ppm of Ca & Mg.

For your convenience:

dH ppm Calcium carbonate equivalent Considered as
3 0 - 50 Soft
3 - 6 50 - 100 Moderately soft
6 - 12 100 - 200 Slightly soft
12 - 18 200 - 300 Moderately hard
18 - 20 300 - 450 Hard
Over 25 over 450 Very hard

Typically most people aim for 2/3rds Ca and 1/3 Mg for hardness. These ratios are often found in natural waters but not always. It depends on the geology of the water catchment.

Sodium and other Gp I compounds will not add hardness.

Remember when you add your ionic chemicals to water they will just be a mixture of ions in solution.

Personally I would search the net for shrimp water requirements and use @ Zeus for his calculator. Unfortunately I have no experience with crystal shrimps. I keep cherries and amonos at about 50 to 100 ppm.

All best wishes
 

H..

Member
Joined
4 Oct 2011
Messages
226
Location
Alnö
To raise gH in 100l tank by 1 deg you need:

4.1g of MgSO4x6H2O (4.3ppm of Mg and 17.2ppm of SO4)

or

2g of CaCl (7.2ppm of Ca and 12.8ppm of Cl)

or percentage mixture of both if you want to keep certain proportions between Ca and Mg (usually 4:1 or 3:1 Ca:Mg).
@Zeus. calc will definitely help you with fine tuning of the mixtures.
Thanks Witcher, this is probably just what I was looking for. I will try this right away.

And the Ca/Mg ratio in my tapwater is 15ppm Ca, and 1ppm Mg, perhaps i can add some more Mg than Calcium due to this

H
 

Zeus.

Member
Joined
1 Oct 2016
Messages
3,001
Location
Yorkshire,UK
the Ca/Mg ratio in my tapwater is 15ppm Ca, and 1ppm Mg, perhaps i can add some more Mg than Calcium due to this
Can use my calculator to work it out, enter your tap water details, WC volume, tank details and it works out what you have added, enter your Target ppm for Mg and Ca and gives you the amount of salts to add to fert mix or dry dosing direct ;)

So for 50% WC
upload_2020-5-7_15-8-52.png
 

H..

Member
Joined
4 Oct 2011
Messages
226
Location
Alnö
Hi again.

Tryed to raise Gh this weekend. Slowly raising and testing once every day.

GH was at 2 in the start in my three tanks at 100 liter and raised them with:
#1, 15ml Ca only, and raised to 5
#2, 15ml Mg only, and raised to 4
#3, 15ml Ca and 15ml Mg. raised to 7.

Testkit was new and I was confident it would work well, and raise GH according to numbers above.
Not quite what was predicted, with above calculations.

H
 

dw1305

Expert
Joined
7 Apr 2008
Messages
9,756
Location
nr Bath
Hi all,
Testkit was new and I was confident it would work well, and raise GH according to numbers above.
Not quite what was predicted, with above calculations.
You know how much of each compound you've added, and how they will change the water chemistry. If the test kit gives you a different answer, any inaccuracy lies with the test kit.

You can construct a <"standard curve"> and that would give you some measure of the difference between measured and theoretical values.

cheers Darrel
 
Top