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kH and TDS

MiZubov

Member
Joined
24 Feb 2019
Messages
73
Location
Russia
Hi!
How much is TDS raised using potassium bicarbonate e.g. 1 tbs on 5 gallons of RO water?
Thanks a lot.
 
Hi!
How much is TDS raised using potassium bicarbonate e.g. 1 tbs on 5 gallons of RO water?
Thanks a lot.
1 table spoon? are you sure am reading this correctly? you are looking at 309 ppm Potassium and 22 dkh
 
1 table spoon? are you sure am reading this correctly? you are looking at 309 ppm Potassium and 22 dkh
Okay, 0,1 tbs. Doesn't matter, because this is just an example. I'd like to know about influence potassium bicarbonate to TDS ^)
 
Quick Heath Robinson test shows 0.5g potassium bicarbonate mixed in 0.5L of DI water gives 532ppm tds. Sure you can scale it up from there.
Edit: seems my test numbers were out, according to the maths the ppm should have been 1000.
 
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@M.eremin do you have TDS meter? so what was your main purpose behind the question? are you raising the TDS for shrimps or something else? let me know if I could further help you with anything.
 
Now I don't have any chemical compounds and aquariums (but I've been doing aquariums last 17 years and now I'm keeping all I know in the book - Ultimate guide to the planted tank, So I'm filling blank spaces in my mind)...
My aquariums from the past Портфолио aqua maxim. Аквариумист Максим Ерёмин
Now I'm analysing the influence different solids and salts on TDS.
How can I calculate it by myself?
Thanks a lot!
@M.eremin do you have TDS meter? so what was your main purpose behind the question? are you raising the TDS for shrimps or something else? let me know if I could further help you with anything.
 
Now I'm analysing the influence different solids and salts on TDS.
How can I calculate it by myself?
1679173675999.png


1679173720590.png


for example: if you were to use K2SO4
add 1.265 gram K2SO4 into 5 gallon
this will add 30 ppm K and 12.3 ppm S
convert S into SO4 by 12.3 x 3 = 36.9
30 + 36.9 = 66.9
TDS = 66.9

K 44.8737 %
S 18.4008 %
O 36.7255 %

36.7255 + 18.4008 = 55.1263
55.1263/44.8737 = 1.228
30 ppm X 1.228 = 36.84 ppm SO4

1679174554364.png

1679175375282.png

for example: if you were to use K2CO3
add 1 gram K2CO3 into 5 gallon
this will add 30 ppm K and 23.02 ppm CO3
30 + 23.02 = 53.02
53.02 TDS

34.7296 + 8.6905 = 43.4201
56.5799/43.4201 = 1.303
30 ppm /1.303 = 23.02

there are many different ways to do this, I hope this helps. you can also use this same formulas to make your stock solutions or recipes.
 
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View attachment 202628

View attachment 202629

for example: if you were to use K2SO4
add 1.265 gram K2SO4 into 5 gallon
this will add 30 ppm K and 12.3 ppm S
convert S into SO4 by 12.3 x 3 = 36.9
30 + 36.9 = 66.9
TDS = 66.9


View attachment 202630
View attachment 202631
for example: if you were to use K2CO3
add 1 gram K2CO3 into 5 gallon
this will add 30 ppm K and 23.02 ppm CO3
30 + 23.02 = 53.02
53.02 TDS

there are many different ways to do this, I hope this helps. you can also use this same formulas to make your stock solutions or recipes.
WOW! Are you autor this program??
Unbelievable....
 
WOW! Are you autor this program??
Unbelievable....
nope, just some simple mathematic and chemistry knowledge/Skills and most calculator does the rest for you. I have further updated the post #10
I missed something earlier and updated it now. I believe this is all you need if you want to make a stock solutions, aiming target ppm, TDS etc.
 
Long as you know the chemicals and their %

these two link is all you need:
Link #1
Link #2

lets assume you want to make a stock solution while using KHCO3
KHCO3 contain 39.0533% K
we are going to Mix KHCO3 in 500 ml Solution
and dose 20 ml from this solution into 5 gallon RO water (18.9271 liter)
this will add 1 ppm K into your 5 gallon RO water
Formula:
100/39.0533*500*1/20*18.9271/1000
google that or calculate it yourself and it will give you the needed grams which is 1.21 grams (1.21161976069 grams to be exact)

lets assume you want to directly add KHCO3 to your 5 gallon (18.9271 liter) RO water
KHCO3 contain 39.0533% K
this will add 1 ppm K into your 5 gallon RO water
Formula:
100/39.0533*500*1/500*18.9271/1000
google that or calculate it yourself and it will give you the needed grams which is 0.048 grams (0.04846479042 grams to be exact)
 
Long as you know the chemicals and their %

these two link is all you need:
Link #1
Link #2

lets assume you want to make a stock solution while using KHCO3
KHCO3 contain 39.0533% K
we are going to Mix KHCO3 in 500 ml Solution
and dose 20 ml from this solution into 5 gallon RO water (18.9271 liter)
this will add 1 ppm K into your 5 gallon RO water
Formula:
100/39.0533*500*1/20*18.9271/1000
google that or calculate it yourself and it will give you the needed grams which is 1.21 grams (1.21161976069 grams to be exact)

lets assume you want to directly add KHCO3 to your 5 gallon (18.9271 liter) RO water
KHCO3 contain 39.0533% K
this will add 1 ppm K into your 5 gallon RO water
Formula:
100/39.0533*500*1/500*18.9271/1000
google that or calculate it yourself and it will give you the needed grams which is 0.048 grams (0.04846479042 grams to be exact)
Thank yo so much!
 
The problem with TDS is following:
It's not difficult to calculate TDS if you know all compounds and their quantity. However, anything like measuring TDS electro-chemically does not exist. There's only electric conductivity (EC) which can be measured, but there's no fixed relationship between TDS and EC, at least when blends of various ions are concerned.
Still, electric conductivity is at least a direct measurement. TDS is a derived, approximate value. You can see if it's increasing or decreasing in time, but you can't take TDS measurements between two meters for comparison - each of them re-calculates TDS from EC using a different formula.
 
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