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Changes
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→Suitable conditions
- No need for mud pump and tower.<br>
- Can work below the groundwater table. <br>
- uses Uses non-corrosive, easily accessible and processable materials (PE and PVC). <br>- less Less endangerment of the workers than when digging an open well shaft. <br>- low Low maintenance costs <br>- low Low cost (approx. US-$ 6 per meter of depth inclusive hand pump) allows for a surface covering potable water supply in the rural area. This is approx. 10 times more economical than the least expensive existing commercially available method. <br>
- adaptable to other countries and regions with similar soil conditions.<br>
| con=
- Does not penetrate rock<br>
- slower Slower than motorized drilling<br>
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This technique adapts best to loamy soils, consolidated materials and light rock. In sticky clays, the mud injection orifices in the bit can get blocked. In pure coarse sands, progress may be slow: the space between the drill stem and the well walls is relatively large, in relation to the slender drill stem, which makes for a slow upward flow. Sand may sink faster than it can be lifted out with the drilling fluid. In such conditions, it may be beneficial to (temporarily) switch to a sludging technique.
==Technical specification==
