Re: It's Raining in Texas!

On Sun, 29 Jan 2006 12:02:33 -0600, Bob Giddings <bobg@xxxxxxxxxxxx>
wrote:

>On Sun, 29 Jan 2006 14:49:55 GMT, hchickpea@xxxxxxxxxxx wrote:
>
>>On Sat, 28 Jan 2006 20:39:46 -0800, "Ben Hogland"
>><benhogland@xxxxxxxxxxx> wrote:
>>
>>>Moss is common on roofs this part of the country. Many use zinc<?>
>>>liners at peaks to kill it. It works well for a while. Looking around my
>>>neighborhood, every roof has moss except for one and it was re-roofed
>>>last summer. As far as my roof, when I bought the place 12+ years ago it
>>>was said to be about 5 years old so 17 years isn't bad to start thinking
>>>of replacing it even though it's been cleaned every other year. :-)
>>
>>FWIW, I've heard of people putting lime at the roof peak to kill moss
>>without damaging the plants below the drip edge. Dunno if it works,
>>but I do know that a garden sprayer full of bleach will kill most
>>anything on a roof without dislodging the protective grit. The bleach
>>mostly turns back into salt before it reaches the ground.
>
>Would you mind explaining how bleach turns "back" to "salt"?
>Seems like too much of either wouldn't be good for plants.
>
>Bob
>
>
>www.arcatapet.net/bobgiddings

Chlor - ox got its start turning seawater into CHLORine and sodium
hydrOXide by using electricity.

Passing an electric current through a saturated salt solution bumps up
the energy level to a point where chlorine,sodium hydroxide and
hydrogen are produced in the ratio of 1/1.13/0.028. This is how we
get bleach. You'll find major chlorine generation located close to
sources of cheap electricity, such as the area around Niagara Falls.

Chlorine disassociates in water into hypochlorous acid [HOCl] and
hydrochloric acid [HCl]. The chlorine ion in the acids is highly
active. In addition to disrupting cell walls and plants in general,
it combines readily with metals to form various more stable salts. If
sodium compounds are available, it can "steal" the sodium and convert
back to NaCl. If calcium is available, it forms CaCl, etc. The
process may not be immediate, but the sea isn't full of salt just by
chance.

You are correct that neither is good for plants, but there are
salt-resistant plants that aren't affected by the small amounts that
come off the roof in the next good rain. Some people use more salt on
their sidewalks than would be formed in this application. If the
house has gutters that lead to a drain, it isn't an issue at all.
.

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