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*6): Besides citric acid, hydrochloric acid (with the maximum concentration of 1.0 mol/L),
oxalic acid (with the maximum concentration of 1.0 wt%), sulfuric acid (with the
maximum concentration of 0.05 mol/L) and nitric acid (with the maximum
concentration of 0.1 mol/L) are acceptable.
In the case of cleaning with acid and with sodium
hypochlorite alternately, rinse the cleaning line
and the module with clean water thoroughly after
each cleaning. Use product water for rinsing and
make sure that pH of the water in the module is in
the range between pH 6.5 and 7.5 after rinsing.
Do not use any other chemicals than those
indicated above.
Do not mix sodium hypochlorite with acid. Such
mixture generates toxic chlorine gas.
The chemical cleaning should be done at least once a year.
Otherwise the module filtration performance could be reduced.
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