Bore hole silted up. Any suggestions?

[glenm64]

I live on the coast and my bore is a centrifugal pump at the bottom of a 2.4m pit and water is about 3m down from there.
This morning the pump stopped working and on investigation it looks like the bore is  silted up. Pump wet end is fine, but the spear is solid in sand just below water level and I cant budge it.
The Einstein who put it in has put the non return valve just below the casing so I can't cut off the valve and back flush it to loosen it and remove.
I was thinking to make an air sparge and try to loosen the spear.
Then I was thinking of making a plonker to get some silt and sand out of the casing.
Any easier suggestions??

Cheers Glen

[Troopy_03]

Can you slide a garden hose down between the suction tube (spear) and the casing? If so, you should be able to flush most of the sand out that way. Where we are on the east coast, we don't even use a separate casing. We use a steel casing with screw together sections to get the depth, then once the spear goes down the casing is removed leaving only the spear in the ground. Also where I am it is only sand all the way down for at least 25M, with a thin (300mm) layer of coffee rock about 2M to 3M down, so to get the casing down all I do is shove a garden hose down the centre of the casing and it almost slides down by itself, with a little bit of rotating by a T handle. And yes, if the spear is full of sand it sounds like your screen is buggered, so has to come out anyway.

[4wd26]

Either water, or if you have compressor (compressed air) can work pretty well

Depends a lot on how much room you have in the casing and pressures you can build up

Sand could have got in through the screen, which will be a bugger as the bore will sand up again even if cleared

If this is the case you may be able to fabricate a new tube and "sock" and utilise the existing casing sort of a bore within a bore

Need to check the sand is not some sort of iron bacteria or other mineralisation causing he block up of he inlet


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