Effects of phosphoric descaler

Have you any information/experience on the effects of Phosphoric Descaler

Occupational Asthma, Specialist, 2/20/2006, 2/20/2006,

I hope somebody else will help out here. The following answer is not well informed. I have seen phosphoric acid used in metal treatments before painting/electroplating etc. It often happens immediately adjacent to a painting process where occupational asthma from isocyanates/epoxy resins/chrome/isocyanurates etc is the problem. I have also seen this used in cooling towers and humidification systems where biocides are added. The biocides are causes of asthma (isothiozolinones, benzalkonium chloride, glutaraldehyde, chlorine releasing agents etc). Can you provide any further help relating to the circumstances of exposure?

2/20/2006