DEFSTAN 68-137/1(1990) : INTERIM
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
WATER PURIFICATION TABLETS
24-02-1995
12-01-2013
Gives requirements for two types of tablet which when dissolved in water, will release chlorine and form a solution suitable for drinking.
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