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Re: [APD] Most tapwater has little CO2

When I used to use a bucket to change water I always had extreme "pearling" on the glass sides, as well as the plants, for several hours afterwards, even with plastic plants. But, my last aquarium was so big I used a permanent plumbing arrangement to change water direct from the house cold water line, and got no pearling on the glass, but considerable pearling on the live plants. Another difference is that with the bucket and small tank, I changed about 2/3 of the water at a time, but with the large tank I only changed 15%. I assumed it was from having oxygen rich water. Now, after reading this thread, I am assuming that the new water was rich in CO2, as well as nitrogen and oxygen.

On Monday, March 21, 2005, at 10:50 AM, Liz Wilhite wrote:

On Mon, 21 Mar 2005 12:56:14 -0500 (EST), Richard J. Sexton
<richard at aquaria_net> wrote:

Fwiw, all tapwater I've ever had: Burlingto, Waterloo, Toronto Ont,
and Los Angeles (PV) all had serious amounts of CO2. So does my well
water here. I think it's the pressurization that does this, which you can
easily demonstrate to yourself with a python.

My aquarium walls pearl after a water change. In an unplanted cichlid tank. If I drop a hunk of wood in there -- that's wood that's been in water for a while -- the nucleation sites are much better than the walls of the aquarium then the wood pearls like crazy without the walls pearling. That's probably because the wood has better nucleation sites than the walls.

I inject a lot of air into the tank with a python.  I tend to expect
that people who change water by means of a python will experience a
lot of pearling, or outgassing, from the water change.  I'd be curious
to know if people who use buckets to change water experience the
pearling that python users have noted.  I still believe it's
outgassing, not plant-induced pearling.


"When his IQ reaches 50 he should sell"
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