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Re: [APD] Lowering KH, Which Is Better: RO Unit or Strong Acid?
>>it is not a simple way to do it
> It "appears" very simple to me. Figure out what your starting KH is.
> Decide what you would like your ending KH to be. Then add the
> appropriate amount of acid. This is no different from figuring out
> how much KNO3/CaCO3/CaCl2/etc. to use. Am I correct to make to make
> this assumption?
The difficulty isn't knowing how much acid to add, it's knowing how much
acid is in the solution you have.
> HANDLING STRONG ACID
> You can purchase the dry forms or liquid form in various
> concentrations from your local pool supply store.
You cannot buy powdered forms of any acid that would be useful for
lowering KH. Powdered acids also contain undesirable cations like
sodium. If you want an acid with hydrogen as it's only cation, it has to
be a liquid.
> pH CRASH
> Another potential problem that I again feel is blown out of
> proportions. A potential pH crash is not a problem that is unique to
> acid users. Recall that RO water contains no buffering capacity (0
> dKH). The acid resulting from the addition of CO2 should induce a
> similar crash yes?
The problem isn't from having a KH of zero, it's from lowering KH while
injecting large amounts of CO2 at the same time. Remember that using an
acid to consume KH releases CO2.
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