Overall, blowing dust out of a hole drilled in a cement floor worked, but there was an unexpected downside. The lamp inhales a small amount of dust each time it is flushed, and its performance has been found to deteriorate. Once I figured that out, it was easy to fix by simply pointing the tube up and quickly squeezing and releasing the bulb until the accumulated dust was removed. It helped if you tap the bottle during this process to make the dust stick to the inside of the bottle. I would buy this product again if needed.
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