Water filtration system and method

A tankless reverse osmosis water filtration system for residential use, comprising:

• a housing having a removable cover, the housing sized to be mounted under a sink;
• a pump in communication with a pre-filter element, a reverse osmosis element having a neck at a first end with a plurality of engagement protrusions extending radially from the neck, and a post-filter element, and the pre-filter element, the post-filter element, and the reverse osmosis element fluidly coupled with a reverse osmosis manifold to form a fluid path through the housing;
• and
• at least two electronic leak detectors disposed within the housing and the cover, the cover being releasably attachable to the housing,
• wherein the reverse osmosis manifold comprises a reverse osmosis cap with a ring fixedly secured to the reverse osmosis manifold and a head rotational within the ring, the ring including a plurality of engagement slots each corresponding to one of the plurality of engagement protrusions and the head including a plurality of cammed slots each having an end surface, wherein each of the cammed slots corresponds to one of the engagement protrusions and engagement slots,
• wherein, when the engagement protrusions are slid into the engagement slots and engage the corresponding cammed slot, rotation of the reverse osmosis element in a first direction causes movement of the engagement protrusions within the cammed slots and the reverse osmosis element axially towards the reverse osmosis manifold until the engagement protrusions contact the end surfaces of the cammed slots,
• wherein further rotation of the reverse osmosis element in the first direction when the engagement protrusions contact the end surfaces of the cammed slots causes rotation of the head, and
• wherein the at least two electronic leak detectors are connected to a controller configured to send a signal to the pump when at least two of the at least two electronic leak detectors are activated.