an indoor / outdoor water filtering apparatus having a pump electrically connected to a power device supplied by an external power source or a rechargeable battery with a switch for user selection of a plurality of operating modes for filtering water in different environments , wherein a first mode electrically connects a first loop with a first pressure sensor cutting off power when water pressure exceeds an upper limit , a second mode cuts off power , and a third mode electrically connects a second loop with a second pressure sensor cutting off power when water pressure is lower than a lower limit .