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<p>[QUOTE=&quot;GDJMSP, post: 4800324, member: 112&quot;]Water under pressure can be and in fact IS used to cut through 3 ft. of steel like a hot knife through butter. BUT - a Waterpik ? Unh uh, there&#039;s not enough pressure in a Waterpik to do any damage to a coin. </p><p><br /></p><p>Waterpiks operate at 10 to 100 psi, depending on the setting you choose. To put that into perspective, your faucets at home, about 60 psi. It&#039;s gonna take way more than that to hurt a coin. So using a waterpik is a about as risky as rinsing a coin under your faucet.</p><p><br /></p><p>And even if the dirt and grime you&#039;re trying to remove has some grit in it, once that grit is loosened from where it&#039;s stuck on the coin, it just flows off with the water that is no longer under pressure. So even it isn&#039;t gonna hurt anything. </p><p><br /></p><p>Now of the water that was being pumped through the waterpik was full of grit, yeah, that might with a bit of time. But the water isn&#039;t full of grit so no harm is done.[/QUOTE]</p><p><br /></p>

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