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The spray—sterili- ailen otddidur "should be performed not
less than 24 hours after the interior palbtTos,dried to touch. i
All interior surfaces of the tank which will ultimately be
in contact with water shall be thoroughlj sprayed to run off with
water containing 200 parts aer'sillion of ehlofthe. This solution
can be obtained byiaddint ous ounce of cilciumf hypochlorital(HTH)
to each twenty-six; gallons of water., t
The surface disinfected, shall remain, ih contact with the
� s.prayed solution for a` minimus of twenty -foul -hours. The surface
shall then be thoroughly ringed and the water flushed from the tanki�
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PIT'T'sBURc3H-DES rViOlNIlu S'ftEL COMPANY
ENGINEERS --MANURACTUPJKM` NTRACTORR_ Da ,X_.7Y