RE: [APD] Re: Ice Dosing?

["Poe Ratana" <poe835 at hotmail_com>]

There are two things that can happen here:
1) Generally, solubility of compounds drop with decreasing temperature. So 
there's a chance that they will crystallize or precipitate out of solution 
when chilled
2) Adding salts to water will decrease the freezing point of the solution. 
So the more compound you add to water, the lower the freezing point will be. 
 You will need a very cold freezer to freeze the concentrated mixture.



> From: Clint Brearley <clint_brearley at telstra_com>
> Reply-To: aquatic plants digest <aquatic-plants at actwin_com>
> To: aquatic-plants at actwin_com
> Subject: [APD] Re: Ice Dosing?
> Date: Mon, 02 Feb 2004 11:15:08 +1100
>
>
> > I'm always looking for ways to simplify and after recent threads
> > I've been
> > pondering ways to get all of my nutrients to the plants without
> > all the
> > mixing and measuring each time.
> >
> > Would it work to mix KH2PO4, K2SO4, KNO3, and traces with water,
> > freeze, and
> > then drop a small pre-measured ice cube in at water change time/twice
> > weekly? What's the effect on these chemicals if frozen? Just a
> > thought...
> > Best,
> >
> > Dave
>
> Sure, why not? Freezing will have no effect. The one problem I foresee is 
> that in a concentrated solution, the traces will form precipitates with the 
> KH2PO4. You'll need separate those two components. Perhaps NPK ice-cubes 
> and traces dosed separately.
>
> Clint Brearley
> Melbourne, Australia
>
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