Re: [Killietalk] SG of 1 tbsp per 5 gallon of water

[Ken Simolo <Simolo at chem_chem.rochester.edu>]

Hi Kris,

Since you do not completely drain the water, one easy way to come 
close is to use a conductivity meter.  Measure the conductivity of 
some water you make up (I believe you said 1 tsp or 1 tbsp per 5 
gallons) and then add salt to your reservoir until you come close to 
that conductivity.  Guesstimate how much you need to add and add only 
about 2/3rds of that to your reservoir.  Wait 5 - 10 minutes to let 
the salt dissolve and distribute and then measure your conductivity. 
Add salt in small amounts, wait and remeasure until you reach the 
right conductivity.

I make up soft water in a reservoir using a similar technique.  I add 
well water equal to about 1/3 of the empty space in the reservoir and 
then add RO water using a float valve that is hooked up to my RO 
system.  I then add salt to get the same conductivity as my well 
water.  That way, when I want to breed a pair of "soft water fish", I 
can take them out of the hard water and just dump them into the soft 
water with no harm to the fish.

Ken


> Yep..you're right.  Of course I had to try it for myself anyway.  I 
> have a refractometer leftover from my reef days, so I thought I 
> might get a small reading.
>
> I wanted to use SG because I'm not sure exactly how much my storage 
> container holds (container thickness plus a few gallons that my pump 
> can't get) and I don't always completely drain it before refilling. 
> I guess I'll stick with one of the other methods.
>
> Thanks,
> Kris Laats


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