On Sun, 21 Nov 2010 23:14:38 -0600, Ignoramus18625
wrote:

I finally visited Wal-Mart and bought two timers. I want to run the
skimmer off of one timer, and aerator (fishtank style air pump) on
another timer.

My question is, do I need a stone on the aerator, or not. I am
concerned that the stone will eventually become plugged by coolant
residue. If bubbling water without a stone is a little less efficient,
I do not think that I care too much.

Any thoughts on this?

i

A stone will make the aeration work better. It won't plug up in a milling
machine sump. They tend to clog in some compartments of my surface grinder
clarifier because the get buried under the settled out grit and grinding dust.

If you get a stone, get a larger one, the small ones have a tendency to float,
then you end up threading 3/4" nuts on the pipe to make them sink. DAMHIKT

The plastic air hose tends to go hard, die to the plasticisers leaching out
into the coolant. This is only a problem if you make later modifications.
Then, new hose is simpler than working with the old stuff.

Mark Rand
RTFM