When done, the bottom opening of the straw should float just above the bottom of your bottle as shown below:
Not all bottles are the same: The shape of the bottom of your bottle may require an adjustment to your straw length. If you meet a lot of resistance when trying to suck on the spout, your straw may be too long and pressing against the bottom of the bottle, preventing free flow. You can test this by unscrewing the lid and sucking on the spout with the lid loosely on the bottle - this should pull the straw opening away from the bottom of the bottle, allowing it to sip freely. To address this case, trim the straw by 1/8" and retest.
The middle position is for venting any pressure that may have built up inside the bottle; this can happen if you are using a carbonated beverage, the bottle sits in the sun or near a heat source, or air pressure changes outside the bottle.
The Paravalve works with liquids up to 140 deg. F (60 deg. C). The hot liquid may expand the air and pressurize the bottle. If you are using the Paravalve with hot liquids, it is important to pause in the vent position for a second or two to prevent hot liquid from coming back up the straw to release the built up pressure.
We don't recommend using the Paravalve straw with liquids hotter than 140 degrees (60 deg. C); the high flow rate could burn your mouth. There may also be a correlation between drinking very hot beverages and esophageal cancer: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2773211/
If you are getting air mixed with water , make sure the straw is fully inserted and the spout is in the fully open position and try again. If the problem persists, then you may be missing the seal under the spout; please contact customer service for assistance.
If there is difficulty sucking water up the straw, The most likely cause is that your straw is too long and pressing against the bottle of the bottle. To check this, loosen the lid so it rests loosely on top the bottle and see if you can now drink easily. If so, your straw is probably too long - trim it and try again. If the problem persists, contact customer service.
If you are getting water shooting out the spout when you open it, then the bottle contents are pressurized due to heat or carbonation. Try slowly opening the spout half way to the vent position, which is mid way between the open and closed position. It will only take 1 or 2 seconds to release any built up pressure. Once the pressure has released, you can open the spout without getting soaked and drink normally.
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