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Re: [APD] Notes on the notion of high K+ causing Ca++ inhibition

If they add the same amount each week and do 50% water
changes each week, then the level pretty much levels off
after a while. Whether that level is massive or not, I
guess depends on how much they dose. No on should dose
anything indiscriminately.

Scott H.
--- John Wheeler <jcwheel76 at yahoo_com> wrote:
> Hey gang,
> The biggest problem (or at least among them), IMO,
> with blind dosing with large amounts of K+ is that the
> majority of hobbyists have no idea how much K+ is
> being used by the tank each week. Test kits are
> expensive , and 50% water changes may not be enough to
> clear the tank of excess... 
> A potential problem here is obvious-- Folks are adding
> K+ onto the K+ that they didn't use last week and
> before long massive quantities build into the water
> column. Nevermind what's in their tap water even if
> it's only an additional 1-2 ppm per week which I don't
> think would be unusual. 
> This could be an area for concern especially since
> we've been told for *years* that K+ levels aren't
> critical-- Shoot for 20ppm or whatever the going rate
> is. I get no deficiencies from 8-10ppm weekly, and I'd
> bet I could get away with less...  
> What is a reasonable expectation for K+ uptakes in a
> week? The recommendation for high and low light
> situations seem to be the same, so is it safe to
> assume that light isn't a factor in K+ uptake? I
> wouldn't expect so... 
> So, if too much K+ causes a salt toxicity which could
> inhibit uptake of Ca, how much is the right amount? A
> little bit? Some? A pinch?... What about those of us
> who choose not to dose KH2PO4, or KNO3?

S. Hieber

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