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Re: buffer pH/Limestone

I do use R/O right but it does not provide much buffering (kh) Also, I dont 
want to use any phosphate based products. I reconstitute with R/O  right and 
some tap water. This gives me a gh of 3 and no measurable kh on three 
different kits. I know I could use Sodium bicarbonate but I think it better 
to use something that the fish and plants could use.

In a message dated 7/5/02 2:57:45 AM Central Daylight Time, 
Aquatic-Plants-Owner at actwin_com writes:

> Date: Thu, 04 Jul 2002 16:25:07 -0700
> From: "Roxanne Bittman" <rbittman at dfg_ca.gov>
> Subject: buffer pH
> I would use Equilibrium (Seachem) or R/O Right instead of lime or just
> calcium carbonate to buffer the water.  Plants need more than Ca and
> carbonate to make leaves!  Pure R/O water has nothing in it at all, so
> you either have to add Mg, Ca, etc or better yet, add back a little tap
> water to do the same thing.  That's what I do, though I have found that
> Onyx substrate (which I use) has quite a strong buffering capacity and
> has both Mg and Ca in it already, so I seldom have to add tap anymore.

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