Very interesting concept. However, there are two disadvantages. 1) Due to the size of the filter and its design, the "actual" amount of water that can be drunk is about 40% less, so you need to refill water frequently. 2) Again, due to the construction of the filter attached to the 'straw', water does not seem to 'leak' when using a spout/straw to drink from a bottle, and therefore there is more when drinking from a spout Power Required / Straw. We are giving the two we bought to our family.
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