~ jan wrote:
GD replies to Sam's post on algae:


Although you are correct , you leave out something that is very
important regarding algae: it is well-documented that most algal
blooms are caused by excessive phosphorus.


I agree, and rarely does most tap water (city treated) have high amounts of
phosphorus. It not just understanding algae, it's understanding the
difference between the different types of algae and their relationships
with each other. See: Green Water at
http://www.koiclubsandiego.org/H2oQual.html


Flow contributes to mixing of nutrients, surely. However, even
without a current, nutrients and minerals will enter the water column

from sediments, unless a physical or chemical barrier exists.

Yea, it's called diffusion.


You'll notice that around fountains there
usually isn't any algae growing.


On the other hand, in ponds with already low concentrations of carbon
(as might occur with a veggie filter filled with submersed plants),
aeration will increase carbon concentrations. This is why algae and
plants do best near waterfalls and fountains in some ponds.


Course this could also be just because the koi can't reach it to remove it,
so it just *seems* like that is where the best growth is. At least that's
my theory regarding my ponds. ;o) ~ jan


See my ponds and filter design:
http://users.owt.com/jjspond/

~Keep 'em Wet!~
Tri-Cities WA Zone 7a
To e-mail see website


--

yup egzactly



John Rutz
Z5 New Mexico

good judgement comes from bad experience, and that comes from bad
judgement

see my pond at:

http://www.fuerjefe.com