sand in well casing

We just drilled a new 4" casing well, 136' deep, water at 125', about 10+ of water to draw from. We are using a Robison Solar pump, with two Solar panels. We got out expected amount of water flow of 1 to 2 gpm for about a day with a fair amount of sand. The flow diminished down to nothing because of sand in the casing jaming the pump. We removed the pump and cleaned it several times. There is about 8' of sand in the casing. We would like to use a hand "Sand Bailer" to remove this sand. The problem is finding one or plans to build one.....According to pictures I've seen, these are made out of a 3' to 4' length of 3 1/2" dia or sq. pipe with a "flapper valve" and dagger point to penitrate the sand at the drop end. If anyone has another idea on how to remove this sand please let us know.
Thanks for your help,

The larger diameter a bailer, the better it works. You can only get a 3" bailer in 4" casing, and it would not dig much sand. Also a bailer needs to be run in and out multiple times and needs a good winch truck. I would recommend a compressor and blowing out the well to get rid of the sand.

Do a search for "sand sucker". I saw that years ago and always remember it.

At the bottom here is a diagram and pictures etc..
http://www.fdungan.com/well.htm

And here is word doc
http://sugarmountainhome.com/homesteading/waterwell.htm

Is your casing open on the bottom?.Upper

The bottom of the 4" pvc pipe is caped......and closed

Thanks for your help, we can use all the suggestion we get!

Thanks for your help....looks like we could run a 2" pipe down the casing and insert a 3/4 pipe into this inserted 2" pipe and flush the sand out???

Thanks for your reply.

Thanks for your help. Got some good info from the web site you gave.

Casing is closed.
Thanks for your help, can use all the suggestions we get!!

Was your well gravel packed? Air baby and a smaller screen...Upper