if you were to try this you would want it on output side of pump as it needs to be pushed through the filter and the gravity fed thing would make your tank overflow everywhere when it starts to require some force to get water through (if not even right from the start). It will probably give you a month of use with decent flow through it as i ran a standard ro sized one as a pre filter to my carbon in years past and it would take 3-4 weeks to stop flowing through well on a maxijet.
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Nick
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