How to Choose the Right Borehole Water Filtration System
A Practical Guide to Safe, Independent Water Supply
Choosing a borehole system isn’t about “buying a filter” — it’s about designing a solution around the unique chemistry of your underground water source. Follow these four steps to ensure a reliable installation.
Step 1: Test Your Water Quality
Never install a system without a SANS-accredited laboratory report. Visual clarity doesn’t equal safety. A SANS 241 compliant test will measure:
- Physical: Turbidity (cloudiness), total suspended solids, colour, and odour
- Chemical: pH levels, hardness (scale), and total dissolved solids
- Heavy Metals: Iron and manganese, common in South African boreholes and known to cause staining and clogging
- Microbiological: E. coli and total coliforms — essential for confirming drinking water safety
Step 2: Define Your Water’s Purpose
Your intended use determines how advanced the system needs to be:
- Drinking Water: Requires the highest level of purification (RO or UV sterilisation)
- Bathing & Appliances: Focuses on sediment removal and scale inhibition to protect geysers and plumbing
- Irrigation & Toilets: Basic sediment filtration to prevent blocked fixtures
Step 3: Calculate Your Water Demand
Size your system for peak flow rates, not just daily averages.
- Daily Use: Budget 150–200 litres per person per day
- Flow Rate: Ensure your system delivers enough litres per minute (LPM) to handle multiple showers and appliances running at once, without a pressure drop
Step 4: Match Filtration Media to Your Results
Once your lab results are in, select the right filtration stages to treat your specific water:
| Contaminant | Recommended Media / System |
|---|---|
| Visible Sand/Dirt | Clino- Vessel |
| Iron (Orange Stains) | DMI-65 Media Filter |
| Hardness (White Scale) | Siliphos (Inhibition) or Ion-Exchange (Removal) |
| Bacteria / E. coli | UV Sterilizer (55W) or Ultrafiltration |
| Chemicals / Pesticides | Activated Carbon Block (CTO) |
| Heavy Metals / Salts | Reverse Osmosis (RO) |
A Note on Water Softeners: Standard softeners remove hardness (calcium/magnesium) but are not a primary solution for heavy metal removal.
Expert Advice: Borehole water chemistry can change over time. We recommend re-testing every 12–24 months to ensure your filtration stages are still performing optimally.
Leave a Reply