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Re: PH crashing up?
- To: Aquatic Plants Digest <Aquatic-Plants at actwin_com>
- Subject: Re: PH crashing up?
- From: Chuck H <grendel at usit_net>
- Date: Sat, 26 Apr 2003 04:18:05 -0400
C. Alan wrote:
The water I am using is a mixture of RO water, and tap water. I add a
little baking soda, Kent's RO right, and some Kent's PH control
Minus. After mixing for about 24 hours, my change out water has a Ph of
around 6.5, A GH of 2, and KH of 2.
What is happening is this: I add my mixed water, and the PH drops down to
around 7. Within 24 hours it will rise up to around 8.4! I tested the
KH, and it is still at 2 or less in some cases. So what is driving the PH up?
What you're seeing is called "pH rebound" or something close. Basically,
the buffer in your tap/tank water is strong enough to throw off the effects
of the softer water. I have a nice explanation of what is happening
chemically stowed away somewhere. I'll try to find it and send it to you
if one of our more chemically enlightened list members doesn't feel called
Are you cutting your tap water with RO water to drive hardness and
alkalinity down? If that's the case, I don't see why you would add bicarb
and the Kent stuff to the change water. Just add enough straight RO water
to your tap water to get the hardness and alkalinity down to where you want
it. For the water already in the tanks, do a few changes with straight RO
to gradually get parameters down. There's no need to mess with all those