Those house filters typically run on 40+ psi and even then the flow rate required through them is fairly small. Now compare that to your typical herbie, if you got three feet of water on top if it, it's only around 1.5 psi or so and the required flow rate would be pretty high as well. Even on a return pump the pressure won't be much higher. The other issue is your tap water is actually really clean, for example if you ran filter socks under your faucets they'd probably never clog up.
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