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54
"With regard to the effectiveness, or otherwise, of the test
used, the Committee are of opinion that the best available
ordinary test was (and is, in fact, invariably) employed by the
Lambeth Sanitary Department. The most reliable test is,
of course, the water test; but bearing in mind the probable
consequences of applying, as a routine, that test to old drains,
there has been a long-standing rule of the Sanitary Department
that this particular test is only to be applied to old
drains at the owner's risk, and with his consent, so that no
responsibility shall afterwards rest with the Vestry."