NAPCO 5831 Operator's Manual page 13

The use and disposal of these chemicals may be
regulated by your local municipality. Consult the
regulations before disposing of these materials.
1. Bathroom tub and tile cleaners. Available at
supermarkets.
2. Any of a variety of "scale removers" available
at your local supermarket or
hardware store. Generally sold for cleaning
coffee makers, humidifiers and vaporizers.
3. Citric acid based cleaners. Contact your lab
supply dealer.
4. A 15 to 35% phosphoric acid solution.
Available form chemical supply dealers for
scale and rust removal. Allow solution to soak
the surface affected until rust and scale is
loosened. Immediately rinse with copious
amounts of clean water.
5. Oxalic Acid 2% to 5% in warm water. Swab
solution on surface allowing it to remain until
rust is loosened. Immediately flush with
copious amounts of clean water.
6. A mixture of 20% nitric acid and 1.5%
hydroflouric acid (or hydrochloric acid). Swab
solution on surface allowing it to remain until
rust is loosened. Immediately flush with
copious amounts of clean water.
The above are ranked in order of mild to strong
cleaning agents. Items 5 and 6 should only be
used if severe rust and scale stains have
developed and cannot be removed by any other
method. In any case the chemical should be
allowed to do the cleaning with minimal scrubbing.
Always follow the manufacturer's instructions.
Chamber Disinfecting
Materials known to be effective in disinfecting are:
*Household Bleach
*Glutaraldehyde
*Alcohol
Consult with your staff chemist for advice on using
these chemicals.
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