As with many other reviews, the original filters that came with the jug were AMAZING! I was able to hold it under a constant medium flow faucet until it filled the entire jug. These filters work with the slowest droplet. I have to fill the reservoir, wait 5-10 minutes for it to filter and then repeat this 4-5 more times to completely fill the jug. DO NOT BUY THESE FILTERS. Unfortunately, as these seem to be the only replacement filters, do not buy this jug filter at all. The costs are ridiculous. UPDATE 9/23/20: I bought another set (apparently the only seller) and the first one was much more effective than the last 3-pack. It's still not as good as what came with the jug, but so far it's a lot better than the last batch. +1 star
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