Follow these instructions to do a simple test for sand in your well.
After correctly installing your T.I.P. deep well pump, test the water. To do this you need a bucket that can hold 10 litres and a 1 euro cent coin.
1) Fill the bucket with 10 litres of water. Important: ensure that the water enters at the edge of the bucket. This will cause a swirl to form in the middle of the bucket, where any sand will be deposited.
2) The 1 cent test: the amount of sand deposited in the bucket must not be more than the size of a 1 cent coin. A larger amount means that there is too much sand in the well.