SOUTHERN REGION OF THE DISTRICT WATER SUPPLY
III (1) / 00 PROJECT 

Location
The project consisted of a variety of – Malawi Villages pressure filters installation
for various locations throughout the southern region of Malawi, as listed below:

Thyolo Site
Three off W 4000 Pressure type Filters having a total capacity of 54 m³/hr

Monkey Bay Site
Four off W 5000 Pressure type Filters having a total capacity of 90 m³/hr

Liwonde Site
Two off Horizontal Pressure type Filters having a total capacity of 130 m³/hr

Zomba Plateau Site
One off W 4000 Pressure type Filter having a total capacity of 18 m³/hr

Domasi Site
Two off W 4000 Pressure type Filters having a total capacity of 36 m³/hr

The W4000 and W 5000 Filter vessels were fabricated from mild steel plate throughout, and epoxy lined internally, and zinc chromate primed externally, and transported from South Africa to Malawi by road.
Head Measurement
Pressure gauges have been installed on each Pressure Filter to determine the head loss over the filter media.

Chemical Dosing
Two different types of chemicals dosing facilities have been provided for each location, consisting of Calcium Hypochlorite (HTH), for pre-filtration and post-filtration, and Aluminum Sulphate, for flocculation.

Backwashing Equipment
Water stored in elevated storage ranks is utilised for backwashing the Pressure Filters

Air Scouring
Roots type URAI Blowers are used to air scour the Pressure Filters.