Convert dh to PPM?

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Convert dh to PPM?

Post by Lee Brouille » Fri, 17 Aug 2001 22:24:23



The test kit I have (Tetra Pond) uses dh (German degrees) instead of ppm.
It seems the vast majority of posters use the ppm standard, so my water
results always look out of kilter compared to those postings.

Also, many people seem to have highly accurate PH readings, like 8.3 . . .
these kits are color coded, and you take .5 jumps. My water is staying
between 8 and 8.5, but I just read that the scale is like the Richtor
scale - each point is 10 times worse than the previous point. So I can
understand that accuracy would be paramount. What test kit gives such a
precise reading?

TIA - Lee

 
 
 

Convert dh to PPM?

Post by Cindy Zone » Sat, 18 Aug 2001 01:55:37


I never figured out the dh to ppm myself.  As near as I can get it... its
something like 17.something so I just round up to 20.

I'd like to know what the exact number is too.

       })i({  Cindy  })i({

  If you think the grass is
 greener on the other side,
        get fertilizer!!!
              : )
    Live, Love, Laugh!!!

Don't lose sight of lifes simple treasures, they cost nothing yet are priceless

 
 
 

Convert dh to PPM?

Post by Nedr » Sat, 18 Aug 2001 02:43:31


Hi ...  to convert dKH to ppm just multiply the dKH x 17.9.

On the chart it shows the # of drops ...  1 dKH  - then in the ppm column it
shows 17.9.  There are your values.

Nedra
www.geocities.com/Heartland/Pines/4836



: I never figured out the dh to ppm myself.  As near as I can get it... its
: something like 17.something so I just round up to 20.
:
: I'd like to know what the exact number is too.
:
:
:        })i({  Cindy  })i({
:
:   If you think the grass is
:  greener on the other side,
:         get fertilizer!!!
:               : )
:     Live, Love, Laugh!!!
:
: Don't lose sight of lifes simple treasures, they cost nothing yet are
priceless

 
 
 

Convert dh to PPM?

Post by Palmsonlemonba » Sat, 18 Aug 2001 03:00:10


Would that be the same conversion for GH?
 
 
 

Convert dh to PPM?

Post by Nedr » Sat, 18 Aug 2001 03:53:23


Yes it would....

Nedra
www.geocities.com/Heartland/Pines/4836

: Would that be the same conversion for GH?
:
:

 
 
 

Convert dh to PPM?

Post by Lee Brouille » Sat, 18 Aug 2001 03:51:15


Thanks, Nedra. Now, do you have any idea which test kits (meters?) folks are
using that give them the integers in between .0 and .5 and then the next .0?
I.E., the .3's, .7's, etc.?  All this math is making my head hurt.  I'm
going to have to invest in a pondside calculator!

TIA, Lee

Quote:
> Hi ...  to convert dKH to ppm just multiply the dKH x 17.9.

> On the chart it shows the # of drops ...  1 dKH  - then in the ppm column
it
> shows 17.9.  There are your values.

> Nedra
> www.geocities.com/Heartland/Pines/4836



> : I never figured out the dh to ppm myself.  As near as I can get it...
its
> : something like 17.something so I just round up to 20.
> :
> : I'd like to know what the exact number is too.
> :
> :
> :        })i({  Cindy  })i({
> :
> :   If you think the grass is
> :  greener on the other side,
> :         get fertilizer!!!
> :               : )
> :     Live, Love, Laugh!!!
> :
> : Don't lose sight of lifes simple treasures, they cost nothing yet are
> priceless

 
 
 

Convert dh to PPM?

Post by Hal » Sat, 18 Aug 2001 03:53:57


I use a Master Test Kit, by Aquarium Pharmaceuticals, Inc. Sold at Pet
Smart.  I suppose different companies make different kits.  More
important for a pH kit to be fresh, they don't last but a few months
and if yours is left from last year you probably need a new one.
There is a high and low range pH kit in the Master Test Kit and the
high range is graduated in .2 increments from 7.8 to 8.4 with a low of
7.4 and high of 8.8.  Your morning and night readings should be within
.4 of each other if the pH is stable in your pond.

One German Degree = 17.9 ppm
6 German Degree = 17.9 x 6 = 107.4

The test liquid measures in dh and there is a chart in the kit so you
don't have to do the multiplying, but it is the same thing and now you
can get your calculator and make your numbers like theirs, if you
want.

Regards,

Hal



Quote:
>The test kit I have (Tetra Pond) uses dh (German degrees) instead of ppm.
>It seems the vast majority of posters use the ppm standard, so my water
>results always look out of kilter compared to those postings.

>Also, many people seem to have highly accurate PH readings, like 8.3 . . .
>these kits are color coded, and you take .5 jumps. My water is staying
>between 8 and 8.5, but I just read that the scale is like the Richtor
>scale - each point is 10 times worse than the previous point. So I can
>understand that accuracy would be paramount. What test kit gives such a
>precise reading?

>TIA - Lee

 
 
 

Convert dh to PPM?

Post by Rod Farl » Sat, 18 Aug 2001 04:43:36


1 degree = 17.8 mg/l CaCO3

You're allowed to visually interpolate within the pH color chart.
(p.s. up to 15% of men have varying degrees of blue/green
colorblindness, and most don't even know it, so this may be
a case in which your wife's opinion is more accurate!)