Once positioned, can the pump be lowered further with the decrease in water level?

Hello,

We have dug a domestic bore (6 inch) around 8 years ago at 450 feet depth in Bangalore and inserted a submersible pump at 300 feet. The bore was working fine. Since last 1 year we are unable to pump water from the bore. Today we scanned the bore and found that water level is at 280 feet, hence bore is able to suck water for 2to3 minutes only. Can we lower the pump further down and position it at 400 feet? As per scanning we saw 2or3 water sources from the holes. Can we get enough water for a single house?

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