We, along with several of our neighbouring houses, have employed a pro to bore in our respective gardens. Refer to Nomad's post
#200 and that's what we have installed. The cost of the drilling to 18 metres, the pump, piping, and the electrics (to a nearby weatherproof housing) was 13,000THB. In addition, I used 4 leftover floor tiles to form a temporary base, and bought 20 curved bricks @12THB each to make a 40cm high platform for the pump. It was all installed a fortnight ago, and has only been used twice (after testing) when our city-fed 1,000 litre tank emptied, but we were away from last Monday to Saturday. The water works topped up our tank three times prior to our leaving, all FOC. I refuse to fill that tank with unfiltered, untreated water from the bore hole, and the new pump alone is adequate to deliver water throughout our 2 storey house, albeit at slightly reduced pressure compared to our old pump by the tank. A series of 4 valves needs changing over whenever we swap supplies between the tank and the bore hole. One of these is on the house-side of the meter and is there (in the present absence of a non-return valve) to prevent water being pumped from the borehole to the city system. The non-return valve is due to be fitted today.
Total cost therefore was 13,240 THB
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