BS 1438:1971
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for media for biological percolating filters
Hardcopy , PDF
05-03-2004
English
07-09-1971
Cooperating organizations
Foreword
Media for percolating filters for treatment of water,
sewage and trade effluents
Function of filter medium
Durability
Soundness test
Large material for base of filter
Mechanical properties
Shape of medium
Specification
1. Scope
2. Durability
3. Sizes of medium
4. Shape, nature of surface and classification of
medium
5. Flakiness
6. Cleanness
7. Sampling and testing
8. Supplier's certificate
9. Independent tests
Appendices
A. Method of sampling
B. Method for the determination of soundness
C. Method for the determination of size (sieve
analysis)
D. Shape, nature of surface and classification of
medium
E. Notes on the use of this standard
Tables
1. Grading limits for media (metric)
2. Grading limits for media (imperial)
3. Size of samples
4. Shape of pieces of medium
5. Surface characteristics of filter medium
Figures
1. Typical particle shapes
2. Thickness gauge
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