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WASH & Water Treatment
Field insights and technical resources on WASH programming, household and community water treatment using Aquatabs and P&G Purifier of Water, and Butyl Products (UK) water storage and sanitation solutions. Covering operations with UN agencies and NGOs across South Sudan, DRC, Sudan, and East Africa.
Rainwater Harvesting and Storage Tanks for Dry-Season Resilience in Africa
Rainwater harvesting tanks in Africa: 1 mm on 1 m2 of roof yields about 0.9 litres. Use the WHO yield formula to size dry-season storage and keep it safe. SLS.
Tony Miller
3 days ago7 min read
El Nino Flood Seasons and Cholera: Why Risk Rises and What Supply Teams Do Before the Rains
NOAA gave a 90%+ chance of a very strong El Nino as of 10 Sept 2026. What it means for cholera risk and what to stock before the rains. From SLS, Juba.
Tony Miller
5 days ago6 min read
Chlorine Tablets vs Granules for Water Treatment
Tablets treat 10 litres each; granules suit tanks. A NaDCC solution lasts 2 days, HTH over 30. How to choose chlorine for humanitarian water, from SLS in Juba.
Tony Miller
5 days ago6 min read
Do Water Purification Tablets Work? What They Remove and What They Do Not
Yes, for bacteria and viruses in clear water: one Aquatabs 67mg tablet treats 8-10 litres in 30 minutes. What tablets miss and how to cover it. From SLS, Juba.
Tony Miller
6 days ago5 min read
Water Tanks for Ebola Isolation and Treatment Sites: Which Type, How Big, How Fast
Plan 100-400 litres per person per day plus a two-day buffer for Ebola treatment site water storage. SLS supplies Oxfam and Butyl tanks from Juba stock.
Tony Miller
7 days ago7 min read
Glass-Fused-to-Steel Tanks for Water Storage in South Sudan
GFS tanks need a reinforced concrete base; an Oxfam T95 ships as a 1,062 kg kit for flat ground. SLS explains which fits where in South Sudan water storage.
Tony Miller
Oct 156 min read
PUR Sachets Explained: How P&G Purifier of Water Works in the Field
One PUR sachet treats 10 litres: stir 5 minutes, strain, wait 20. How P&G Purifier of Water works in the field and when to use it, from SLS in Juba now.
Tony Miller
Oct 146 min read
Ebola Chlorine Solutions Explained: 0.05%, 0.5% and 2% and What Each Is For
Ebola guidance uses 0.5% chlorine (5,000 ppm) for spills, surfaces and gloved hands, 0.05% (500 ppm) for skin and linen. Sourced to WHO and MSF, from SLS.
Tony Miller
Oct 127 min read
Keeping Stored Water Safe: Chlorination, Residual and Cleaning for Emergency Tanks
Safe water storage tanks need 0.2 mg/L free chlorine at the point of delivery, a lidded cover and a WHO-method clean. The field routine, from SLS in Juba.
Tony Miller
Oct 107 min read
Siting and Installing Emergency Water Tanks: A Field Checklist
Emergency water tank installation starts with the site: a 45 m³ Oxfam steel tank takes 2 to 4 hours to erect on level, drained ground. Checklist from SLS.
Tony Miller
Oct 88 min read
El Nino and Drought in Africa: Water Storage and Treatment When Sources Fail
El Nino drought risk in Africa is a southern Africa story from Oct 2026, per FEWS NET. SLS sets out storage, treatment and pre-positioning before sources fail.
Tony Miller
Oct 67 min read
Sustainable Water Treatment for Camps and Settlements
Sustainable water treatment in a camp means holding 0.2 mg/L chlorine at delivery long after launch. SLS sets out the supply, power and cost tests to apply.
Tony Miller
Oct 67 min read
WASH in Emergencies: What to Deliver in the First 72 Hours
In the first 72 hours, deliver 15 litres of safe water per person per day, then toilets, handwashing and soap. SLS maps WASH equipment to each priority.
Tony Miller
Oct 26 min read
Water Storage for the Sudan Refugee Response: Tank Options, Sizing and Supply Routes
Size Sudan refugee water storage from 15 L per person per day: 10,000 people need 150 m³ daily. Oxfam steel and Butyl tank options, with Juba supply from SLS.
Tony Miller
Oct 28 min read
How Many Aquatabs Does a Response Need? Forecasting Tablet Demand
Forecasting Aquatabs demand turns a population and Sphere's 7.5-15 litre water standard into tablets, weight and shipping volume. SLS shows the working.
Tony Miller
Sep 177 min read
Handwashing Stations in an Outbreak: Specification and Supply
A handwashing station belongs at every latrine, clinic entrance and food point, stocked with soap or 0.05% chlorine. SLS specifies and supplies them at scale.
Tony Miller
Sep 166 min read
What Is in a Field Water Quality Test Kit, and What Do You Actually Need?
A field water quality kit needs six core items: chlorine, pH, turbidity, temperature and a faecal-indicator test, plus spare consumables, from SLS in Juba.
Tony Miller
Sep 155 min read
Designing a Camp Water Point: Tapstands, Queues and Drainage
A camp water point works to 250 people per tap and a 500 m walk. Get the layout, drainage and lighting right and queues and safety follow. SLS ships from Juba.
Tony Miller
Sep 146 min read
Jar Testing and Dose Setting: Finding the Right Chlorine Dose for Your Source
A jar test sets the working dose holding 0.2 to 0.5 mg/L free residual chlorine after 30 minutes, since dose varies by source. SLS explains the field method.
Tony Miller
Sep 117 min read
What Is Turbidity, and What NTU Can You Actually Chlorinate?
Turbidity above 5 NTU stops chlorine working, per the Sphere standard. SLS explains how NTU is measured and when to pre-treat with P&G PUR before dosing.
Tony Miller
Sep 104 min read
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