On Apr 14, 2:09 pm, "BoyPete" wrote:
Is there an easy test for oxygen content in pond water?
I have an air pump with twin outlets combined into one, feeding an airstone
in the pond. Is there any advantage in putting a stone in my box filter?
--
ßôyþëtë
London, UK

Everyone seems to have answered positively to the airstone being in
the filter box; and this may well be the best use of the two outlets.
But I will at least mention that this will probably not do lots for
adding oxygen to the pond. Remember it is the air bubbles breaking
the surface of the water that actually make the oxygen exchange into
the water. JMO
Bill

Unfortunately, this is contradicted by physics. Aquatic ecosystems has a
nice write up about oxygen exchange across air bubbles below the surface and
that the finer the bubbles, the greater the exchange. Furthermore, fine
bubbles also allow nasty gases to exchange as well and get blown out of the
surface as the bubbles break. Ingrid

Remember it is the air bubbles breaking
the surface of the water that actually make the oxygen exchange into
the water

the surface of the water that actually make the oxygen exchange into
the water-

How does a waterfall or a stream compare to a bubbler? Do they have
stats for that? They make for a lot of surface exposure. Jim set up
our berm to have the water go over four falls before running down an 8
foot stream into the pond. He saw that as getting pretty near full
oxygenation.

Phyllis

as a passive system independent of an air pump, it is excellent as long as
it isnt a smooth flow. the more it burbles and "talks" the greater the
surface to air ratio. I have a big aquatic ecosystem air blower with a foot
long sintered glass airstone that makes tiny bubbles. it is 6 inches below
the surface and the water just boils with tiny bubbles.
http://www.aquaticeco.com/index.cfm/...Detail/ttid/49
http://www.aquaticeco.com/index.cfm/.../techtalk.list
Ingrid


"Phyllis and Jim" wrote in message
oups.com...
How does a waterfall or a stream compare to a bubbler? Do they have
stats for that? They make for a lot of surface exposure. Jim set up
our berm to have the water go over four falls before running down an 8
foot stream into the pond. He saw that as getting pretty near full
oxygenation.

Phyllis

On Tue, 17 Apr 2007 07:04:51 CST, Phyllis and Jim
wrote:

How does a waterfall or a stream compare to a bubbler? Do they have
stats for that? They make for a lot of surface exposure. Jim set up
our berm to have the water go over four falls before running down an 8
foot stream into the pond. He saw that as getting pretty near full
oxygenation. Phyllis

Hiya Phyllis, There was an article, but now I can't remember whether it was
in a magazine or on the web regarding this, with stats. What I remember
from it was that water falling on rocks got the highest score, then
fountains, then airstones... I believe. I'm only positive about the water
falling on rocks. ~ jan
------------
Zone 7a, SE Washington State
Ponds: www.jjspond.us

humBill wrote:
On Apr 14, 2:09 pm, "BoyPete" wrote:
Is there an easy test for oxygen content in pond water?
I have an air pump with twin outlets combined into one, feeding an
airstone in the pond. Is there any advantage in putting a stone in
my box filter? --
ßôyþëtë
London, UK

Everyone seems to have answered positively to the airstone being in
the filter box; and this may well be the best use of the two outlets.
But I will at least mention that this will probably not do lots for
adding oxygen to the pond. Remember it is the air bubbles breaking
the surface of the water that actually make the oxygen exchange into
the water. JMO
Bill

Thanks Bill.
--
ßôyþëtë
London, UK