# Re: [APD] Qs re dKH maintenance

Sure, the margin of error looks fine to me for our purposes.  But I'd
suggest thinking about and explaining where the 52.8 is coming from --
without the units and explaining the conversion, it's a magic number.

On Fri, Mar 23, 2012 at 1:10 PM, Carlo Flores <apd at petalphile_com> wrote:
> Sure, the margin of error looks fine to me for our purposes.  But I'd
> suggest thinking about and explaining where the 52.8 is coming from --
> without the units and explaining the conversion, it's a magic number.
>
> On Fri, Mar 23, 2012 at 11:04 AM,  <rader at hep_wisc.edu> wrote:
>>
>>  > Your bicarb calculation should be mg bicarb = gal of water *
>>  > 3.785L/gal * 30mg/dKH * delta dKH.  Depending on your baking soda and
>>  > how well you pack it into the tsp, you should have about 4.8g per tsp
>>  > of baking soda.
>>  >
>>  > I think you excluding units in this calculation and using 5.28 is
>>  > confusing (but gets you pretty close.  Rule of thumb is 30mg baking
>>  > soda raises 1L by 1dKH, as per the formula above.)
>>
>> Actually, typo, that should be "52.8.".. so we have...
>>
>>  you: 30mg_bicarb/L/dKH * 3.785L/gal * 1tsp/4800mg = .0235 tsp/gal/dKH
>>
>>  me: (1/52.8)tsp_bicarb/gal/dKH = .0189 tsp/gal/dKH
>>
>> ...so we're probably within +/- the variation from packing of the
>> baking soda?
>>
>> steve
>> --

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