AnnualReport-1937 — Page 439

Table VII shows the arrangements regarding filtration: --

Table VII.

Name of plant Normal capacity (million gallons per day) Locality Remarks Eastern Island 2.6 Slow sand with pre-filters Bowen Road 3.0 Albany 1.8 Elliot 1.8 * 4.0 39 West Point 0.7 > Chai Wan 0.2 19 14.1 Shek Li Pui Kowloon Mainland 15.0 Paterson's rapid gravity 3.0 Slow sand only Slow sand with pre-filters Paterson's rapid gravity Slow sand only 18.0 Total Mainland capacity 14.1 Total Island capacity 32.1 Total capacity

With the exception of supplies in the Pokfulam area of the Island all water from Government supplies is chlorinated after filtration. Chlorination is generally carried out by means of Paterson chloronomes.

The dosage of chlorine varies seasonally but averages about one half part per million.

Bacteriological results for 1937 were as follows: —

Table VIII.

Samples B. coli communis 1,028 were absent in 50 c.c. (89.8%) 86 were above standard - (B. coli absent in 10 c.c.) (7.5%) 31 were below standard (2.7%) 1,145 Total number of examinations made (of filtered water)