Use rubber gloves to remove the top from the jar and wash completely to remove any poisons. Turn lid upside down and examine suction tube for breaks and clogging. If tube is broken, discard whole thing and try another brand. There are four phillips head screws readily visible. Remove screws to reveal innards of gadget. The suction tube has a spring on it. If tube is clogged you can now try to get water through it and flush . If it is clogged and does not flush, throw the thing away. My suction tube was ok, but the thing wouldn't work. Now look at the dial, which is loose. Note which side is up and, when you take it off, note the hole with the black o-ring under it.Now look at the dial. You will see a series of holes, starting with a big one and progressing to tiny ones. Suction through these holes makes the thing work and a given setting will not work if its hole is clogged. Do not try to poke something in the holes. That would spoil your calibration. Use an air compressor, if you have one, to blow out each hole from each side. No compressor, try a straw. Reassemble, maybe having a helper hold it together against the spring tension while you put the screws in. Put some water in a cup, attach hose, turn water on and see if water disappears from the cup at each setting. Worked for me.
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Use rubber gloves to remove the top from the jar and wash completely to remove any poisons. Turn lid upside down and examine suction tube for breaks and clogging. If tube is broken, discard whole thing and try another brand. There are four phillips head screws readily visible. Remove screws to reveal innards of gadget. The suction tube has a spring on it. If tube is clogged you can now try to get water through it and flush . If it is clogged and does not flush, throw the thing away. My suction tube was ok, but the thing wouldn't work. Now look at the dial, which is loose. Note which side is up and, when you take it off, note the hole with the black o-ring under it.Now look at the dial. You will see a series of holes, starting with a big one and progressing to tiny ones. Suction through these holes makes the thing work and a given setting will not work if its hole is clogged. Do not try to poke something in the holes. That would spoil your calibration. Use an air compressor, if you have one, to blow out each hole from each side. No compressor, try a straw. Reassemble, maybe having a helper hold it together against the spring tension while you put the screws in. Put some water in a cup, attach hose, turn water on and see if water disappears from the cup at each setting. Worked for me.