Hi - One thing to try as a ...

Hi - One thing to try as a quick fix is to assess whether you have the possibility to lift the pump to a higher level. Saline water is more dense than fresh water so you may be able to exploit fresher water within the upper section of the well. For example if the well is 30m deep with a 10m water level and the pump is set close to the base then you may be able to retract the pump to say 18-20m and see if the water quality improves. An ability to do this depends on how far your water level draws down ( dynamic level ) when being pumped.  Also do you have the ability to pump less water for longer ? Pumping the well at a lower rate but for longer if using a storage tank may help to reduce the saline intrusion. Good luck and keep us posted !   Iain Howley ( UK Well Drilling Engineer )