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Occasionally when you try to take a solution sample by syringe, no air or water can be sucked out. This is because the 4 mm extraction tube is blocked. The most common cause of a blocked extraction tube is insects crawling into the open end. The end of the 4 mm tube can be pushed over the nipple on the black stake provided in the kit. This keeps out insects as well as soil particles. Note that the current stake tends to widen the end of the extraction tube, which can give a poor seal around the syringe. The extraction tube can also be crimped shut. Forcing water down the tube with the syringe is often sufficient to remove a blockage. Note that the FullStop will still work perfectly well with a blocked extraction tube, but water samples cannot be taken for sampling. |
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