Aquarium bubbly things

Anyone using an aquarium 'stone' and air pump to keep their coolant tank sweet and if so does it work?
AWEM

On Wed, 2 Feb 2011 17:59:48 -0000, "Andrew Mawson"
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Yes and yes. Six stones in the J&S coolant settling tank, one for each compartment. Run from a timer :-)
Although switching from Hysol Excel to Vcut-SS has lessened the need for it, since it doesn't seem to get infected as quickly.
Mark Rand RTFM

Andrew Mawson wrote:
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I've got one in the Harrison M300 coolant tank, as to whether it works, its only been running for an hour a day for the last 4 years or more and the coolant hasn't gone bad yet. Time will tell. I expect I should think about the life of the corrosion inhibitors as they may have expired. I don't actually use the coolant that often though and clean down the wet surfaces after its use.
As usual with these unintended uses of items I went into a pet store and told the assistant what I was doing, expecting a strange response, but she just mentioned that for what I wanted their cheapy £10 starter kit with pump, stone, and pipe would in all likelyhood be fine, it has been. A timer for £6 or £7 from the local DIY store and it was put to work.

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coolant
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work.
I'm intrigued why you are both using timers, as the pumps I've looked at are extremely low consumption - 5 watts or so and probably less than the timer!
AWEM

On Wed, 2 Feb 2011 19:52:03 -0000, "Andrew Mawson"
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If you have it running all the time, the coolant will disappear quite rapidly. My shed is dry enough that I get significant evaporation even without the bubbler. My pump takes 4.5W and the clock takes .25W, but it's the evaporation that I do it for.
Regards Mark Rand RTFM

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They work because the sulphate reducing bacteria (SRB) living in the bottom are anaerobic, i.e. they don't like oxygen. Stir them up and add oxygen and they die.