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Hi Purplehat
Sorry to hear about your husband and I really hope he is on the mend. Its funny that I get to see both sides of the bacteria fence. One one hand i'm trying to get them to breed in my current job, yet on the otherhand as an Emergency Transport Attendant with St.John Ambulance i'm trying to kill them off.
I agree with what your saying, but the problems with formaldehyde lie further down the line in the water treatment plants. It doesn't take much to kill off an effluent plant believe me its happened here (we use formaldehye as a biocide as well as Peroxide and BIT) in our products and I hate the stuff, and it always gives me the shakes the way production splash the stuff around then wash it down the drains. What i'm getting at is the nitrosomas and nitrobacters are more easily killed off than the likes of E Coli, C Diff etc. Which disrupts the balance in any activated sludge system, and takes ages to get going again. Sorry if I confused anyone. I have to say that running an effluent plant is a bit of an art rather than a science as you have little control over what the little buggers are up to, and anything that disrupts or is out of the ordinary can be catastrophic, leading to all sorts of nasty stuff leaching into the local watercourse.
Jon
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