I don't know what the C or F stands for, but it is a meter I use to check
how strong my solution is in the tank. I try and keep it to a CF level of
18-20, although all different plants like it different. For example,
lettuces like a CF of 10-12, whereas beans and tomatoes prefer it around
18-20. I am pretty sure it works on conductivity in the water. I test my
meter by putting it in plain tap water, which should have a reading of 0.
Then add a little salt to some water, and it should start reading a few
points up the scale.

My dad has been doing hydroponics for a few years here at home, and has
learnt a fair bit, so when I wanted to set the system up again, he passed on
all the gear and meters etc. He used to use a pH meter, but found it was as
useless as cats **** in figuring out what the plants need.

--
Anna Merchant

http://www.thecotfactory.co.nz
If electricity comes from electrons, does that mean that morality comes from
morons?

"Repeating Decimal" wrote in message
...
in article , Anna Merchant at
wrote on 3/31/03 5:45 PM:

That sounds about right considering how fast my setup loses water. It
must
be a small setup compared to some, but the tank holds about 50 odd
litres I
would assume, and every week I top it up with a watering can full. So
that'd
be, geez, bout 10L maybe. My tank / setup isnt enclosed, so it does get
filled with rain water. Just means I have to check my CF more often.

My evaporation rate is much higher than yours. But it has been very warm
here lately.

By the way, what does CF mean?

Bill