Class 6 vs. Class 9: Choosing the Right Borehole Casing in Zimbabwe
As water scarcity becomes a pressing concern, boreholes offer a sustainable solution. However, the success of your borehole depends on choosing the right casing. In Zimbabwe, the two most common options are PVC Class 6 and Class 9. Understanding their differences is critical for the efficiency, durability, and safety of your investment.

Head-to-Head: Class 6 vs. Class 9
Feature | PVC Class 6 Casing | PVC Class 9 Casing |
---|---|---|
Ideal Depth | Shallow boreholes (up to 100m) | Deep boreholes (up to 500m) |
Primary Use | Domestic, small-scale irrigation | Commercial, industrial, large-scale farming |
Key Advantage | Cost-effective and lightweight | Superior strength and high-pressure tolerance |
Main Limitation | Limited structural integrity in deep wells | Higher initial cost and heavier to install |
How to Make the Right Choice
The depth of your borehole is the primary factor. If your project is shallow (under 100 meters), Class 6 may suffice. However, for deeper wells, Class 9 is essential to withstand the immense external pressure and ensure the borehole does not collapse over time.
For basic domestic needs, Class 6 is often adequate. But if you are planning for large-scale irrigation, industrial use, or high-pressure pump systems, the superior strength of Class 9 is a much safer and more reliable option.
The soil and rock formations around your borehole can significantly impact pressure levels. A professional driller can assess the geology and recommend the appropriate casing. In unstable or rocky ground, the durability of Class 9 provides critical long-term protection.
The Golden Rule of Borehole Drilling
While the initial cost of Class 9 casing is higher, it is a long-term investment in the security and longevity of your water source. A collapsed borehole due to inadequate casing will be far more expensive to repair or re-drill. Reputable companies like Borehole Experts Zimbabwe prioritize quality and will always recommend the casing that guarantees the structural integrity of your borehole for decades to come.
It is essential to use high-quality, food-grade uPVC casings to prevent harmful chemicals from leaching into your water. Choosing a certified installer ensures that the materials used are safe for drinking water and that the installation is environmentally responsible.
Expert FAQs
It is strongly discouraged. The external pressure from soil and water at greater depths can cause Class 6 casing to collapse, leading to a complete failure of the borehole. Class 9 is specifically engineered to handle these high-pressure conditions.
Yes. The diameter must be large enough to accommodate your submersible pump comfortably and allow for any future maintenance. A professional driller will recommend the optimal diameter based on the borehole's depth and expected yield.
A professional borehole company is committed to sustainable practices. This includes responsible disposal of drilling waste and minimizing environmental disruption. This approach protects your property and the surrounding ecosystem.
Secure Your Water Future with Confidence
Choosing the right borehole casing is a critical decision. Partner with the experts at Sona Solar Zimbabwe and our trusted drilling partners to ensure you get a reliable, safe, and sustainable water source for years to come.
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Sona Solar Zimbabwe
Sona Solar Zimbabwe
7 Frank Johnson Avenue,
Avenues, Eastlea
Harare, Zimbabwe.
Call Us Today:
Solar Sales:
+263 78 293 3586
Solar Sales:
+263 78 922 2847
Operations:
+263 78 864 2437
Sona Landline:
+263 24 2797750
Email:
sonasolarzw@gmail.com
Website:
www.sonasolar.co.zw

Borehole Experts Zimbabwe
Borehole Experts Zimbabwe
7 Frank Johnson Avenue,
Avenues, Eastlea
Harare, Zimbabwe.
Call Us Today:
Borehole Sales:
+263 77 389 8979
Borehole Sales:
+263 71 500 3777
Borehole Operations:
+263 71 918 7878
Borehole Landline:
+263 24 2797750
Email:
boreholeexpertszw@gmail.com
Website:
www.boreholeexperts.co.zw