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Drilling quality boreholes with jetting method

In Timor Leste, we are starting to drill shallow boreholes using the jetting method. The tools and local skills of our partners are very basic, but we are achieving relatively decent construction quality results, at first glance. However, early water quality testing results are showing moderate microbiological contamination. We have no obvious direct sources of contamination and are assuming that a primary reason might be that we do not have a decent sanitary seal in place. Another issue of concern is that we are drilling with galvanized iron pipes (4") and the filter slots are being cut by hand. Although the water Ph is relatively neutral, we would prefer using a PVC lining to avoid future corrosion and iron contamination issues. We are drilling through sandy an gravel soils.

So, that said, a couple of questions: 1. Does anyone have experience on jetting with PVC pipes directly? 2. Are their easy or recommended ways to install a good sanitary seal?

Thanks

Drilling quality boreholes with jetting method

In Timor Leste, we are starting to drill shallow boreholes using the jetting method. The tools and local skills of our partners are very basic, but we are achieving relatively decent construction quality results, at first glance. However, early water quality testing results are showing moderate microbiological contamination. We have no obvious direct sources of contamination and are assuming that a primary reason might be that we do not have a decent sanitary seal in place. Another issue of concern is that we are drilling with galvanized iron pipes (4") and the filter slots are being cut by hand. Although the water Ph is relatively neutral, we would prefer using a PVC lining to avoid future corrosion and iron contamination issues. We are drilling through sandy an gravel soils.

So, that said, a couple of questions: 1. Does anyone have experience on jetting with PVC pipes directly? 2. Are their easy or recommended ways to install a good sanitary seal?

Thanks