[Histonet] ? potassium permangante filters, end point

[Cormier, Kathleen]

Hello Netters,

 

I was wondering if anyone has a reference or knows where I can track
down information on determining the end point of potassium permanganate
filters by dropping the used portion of the filter particulate into
water. 

 

I have heard that if you drop the used filter particulate in to water
and it turns a certain color (purple or brown) you can find out if the
filter is used up. Rumor? Outright lie? Correct? (and the manufacturer
at this point is useless on determining the real end point of the
filters for our HVAC system.) 

 

Thanks for any help!

 

Kathy 

 

 

 

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