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I've seen the following perlator and similars (also plastic ones) on some shopping sites. They claim it can decrease water consumption up to 40%. Is it possible? Is it worth to try?

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If you are filling a pot, or your sink, it will take the same amount of water anyway. It will reduce the amount of water you use when washing your hands, or rinsing dishes. – Brad Gilbert Sep 15 '10 at 14:13
up vote 8 down vote accepted

I've had a couple of these over the years and found that their biggest benefit was the ability to convert to a spray for better rinsing of dishes if your sink doesn't have a separate sprayer, not so much their water-saving ability. Even though a 40% reduction sounds like a lot, your kitchen sink doesn't use that much water to begin with compared to, say, your shower or clothes washer. So reducing your kitchen sink usage by 40% may not produce noticeable results on your water bill.

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I'd echo what Mike said. We have one like this, mainly because we don't have a spray head. This is a cheap and simple way to add a spray head. That it may save some water is a bonus. – user558 Sep 15 '10 at 14:34

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